Right Text Align

Question

$ABC+A^{'}B+ABC^'$ \\
$= AB(C+C^{'})+A^{'}B$
\hspace*{1in} (Common Parantheses)\\
$= AB + A^{'}B$
\hspace*{1in} (Complement Law)\\
$= B(A+A^{'})$
\hspace*{1in} (Common Parantheses)\\
$= B$
\hspace*{1in} (Complement Law)

I want to align "Common Parantheses" and "Complement Law" according to the right of page. Actually, I want to do something like hspace but from right, or hspace but relative to page not to text.

Don't use \\ for new lines in normal text. The amsmath package provides a lot of environments to align equations properly and which usually look good. Or are you not using LaTeX? — Qrrbrbirlbel, Oct 24 '22 at 13:06
Off-topic: Both ^{'} and ^' are wrong. It should just be '. — Mico, Oct 24 '22 at 13:13

score 0 · Answer 1 · answered Oct 24 '22 at 12:53

Something like this? (The framelines at the edges of the text block are drawn by the showframe package.) The solution employs an align* environment and four \tag directives.

\documentclass{article} % or some other suitable document
\usepackage{amsmath}    % for 'align*' env. and '\tag' macro
\usepackage{showframe}  % optional: draw frame around text block
\begin{document}
\begin{align*}
ABC+A'B+ABC'
 &= AB(C+C')+A'B \tag{Common Parentheses} \\
 &= AB + A'B     \tag{Complement Law}     \\
 &= (A+A')B      \tag{Common Parentheses} \\
 &= B            \tag{Complement Law}
\end{align*}
\end{document}

score 0 · Accepted Answer · answered Oct 24 '22 at 13:00

Note that ^{'} and ^' are wrong and should simply be '.

I guess you want something like

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
&ABC+A'B+ABC' \
&\quad= AB(C+C')+A'B && \text{(Common Parentheses)} \
&\quad= AB + A'B     && \text{(Complement Law)} \
&\quad= B(A+A')      && \text{(Common Parentheses)} \
&\quad= B            && \text{(Complement Law)}
\end{align}
\end{document}

I see no reason for pushing the justifications to the right margin, nor the formulas to the left margin; actually, I see several reasons not to.

Is it possible to have the justifications at the right margin? Yes, certainly so. Compare

\documentclass{article}
\usepackage{amsmath}
\usepackage{lipsum} % for mock text
\usepackage{showframe} % to see the margins
\begin{document}
\lipsum[1][1-4]
\begin{align}
&ABC+A'B+ABC' \
&\quad= AB(C+C')+A'B && \text{(Common Parentheses)} \
&\quad= AB + A'B     && \text{(Complement Law)} \
&\quad= B(A+A')      && \text{(Common Parentheses)} \
&\quad= B            && \text{(Complement Law)}
\end{align}
\lipsum[2][1-4]
\begin{flalign}
&ABC+A'B+ABC' \
&\quad= AB(C+C')+A'B && \text{(Common Parentheses)} \
&\quad= AB + A'B     && \text{(Complement Law)} \
&\quad= B(A+A')      && \text{(Common Parentheses)} \
&\quad= B            && \text{(Complement Law)}
\end{flalign}
\lipsum[3][1-4]
\end{document}

Do you want your readers to have a hard time following lines with so large blank space between the two parts?

Right Text Align

2 Answers2