Answer
$x = -4$
Work Step by Step
The two sides have the same base.
Use the rule $a^m=a^n \longrightarrow m=n$ to obtain:
$x=3x+8$
Subtract $3x$ to both sides of the equation to obtain:
$\begin{array}{ccc}
&3-3x &= &3x+8-3x
\\&-2x &= &8
\end{array}$
Divide by $-2$ to both sides of the equation to obtain:
$\dfrac{-2x}{-2} = \dfrac{8}{-2}
\\x = -4$
