How to align different numbered formulas to the left

Question

How to align different numbered formulas to the left.like the picture:

How to align different formulas to the left and have different numbers. My code like this will only make it have a common number.

\begin{equation}
\begin{aligned}
\gamma_{x} &=-i t^{\prime}\left(\lambda-\lambda^{-1}\right) \\
\gamma_{y} &=0 \\
\gamma_{z} &=\Delta-\lambda t-t \lambda^{-1}
\end{aligned}
\end{equation}

Answer 1

To typeset displayed equations -- numbered or unnumbered -- close to the left-hand edge of the text block, be sure load the amsmath package and to specify the option fleqn (short for "flush-left equations", I suppose).

\documentclass[a4paper,12pt,fleqn]{article}
\usepackage{amsmath,amssymb}

\begin{document}
\begin{align}
\gamma_{x} &= -i t'(\lambda-\lambda^{-1}) \\
\gamma_{y} &= 0 \\
\gamma_{z} &= \Delta-\lambda t-t \lambda^{-1}
\end{align}
\end{document}