\documentclass[11pt]{article}
\usepackage{graphicx}
\usepackage[margin=1in]{geometry}
\usepackage{amsmath}
\usepackage{float}
\begin{eqnarray*}
8+4-3*2&=&x (1)
8+4-6&=&x (2)
12-6&=&x (3)
x&=&6 (4)
\end{eqnarray*}
\documentclass[11pt]{article}
\usepackage{graphicx}
\usepackage[margin=1in]{geometry}
\usepackage{amsmath}
\usepackage{float}
\begin{eqnarray*}
8+4-3*2&=&x (1)
8+4-6&=&x (2)
12-6&=&x (3)
x&=&6 (4)
\end{eqnarray*}