\documentclass[a4paper,10pt]{article}
\usepackage{latexsym}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{mathrsfs}
\usepackage{bm}
\usepackage{graphicx}
\usepackage{wrapfig}
\usepackage{fancybox}
\pagestyle{plain}

\begin{document}

\noindent
Solve each equation.

$4x+4(2x-1)=20 4x+20=5(x+3)$

$5x+15=10(x$-3) $2x+5=17$

$3x-4=4(3x-19) 3(2x-4)=3x-5(x+1)$

$-0.4x-6(3x-\ 2) =48.8$ 2 $(x+3)=5x+15$

$2x+1=7-10x 5x-3=15-4x$

4{\it x} $-10=3(x+2) 6(x+2)=5x$-9

$5x+10(4x+3)=15 2(x+3)=5(x$-3)

$-4x+7=5(x+2)$ 7{\it x} $=2(x$-3)

{\it 5x} $-15=4x+3 5(x+0.5)=-1.5(x+3x)$

$2(2x+2)+x=3x$-4 2{\it x} $=3(x+2)$
$$
2x+4(3x+6)=12 2x+2(2x-3)=-3
$$
Solve each literal equation for the indicated variable.

$L\times W\times D=V$, for $W$

{\it C} $=2\pi r$, for $r$

$V_{1}P_{1}=V_{2}P_{2}$, for $P_{1}$

{\it q} $=q_{p}\times D\times \mathrm{Q}$, for $q_{p}$

{\it T} $=T_{o}-a(z-z_{0}))$ for $a$

{\it A} $=(a+b)h$, for $h$

\end{document}