Answer
$x=-\dfrac{8}{b}$
Work Step by Step
$b$ is a nonzero constant so both sides of the equation can be divided by $b$.
$$\begin{align*}
(2b-b)x&=-8 &\text{Perform the subtraction,}\\
bx&=-8 &\text{Simplify.}\\
\frac{bx}{b}&=\frac{-8}{b} &\text{Divide $b$ to both sides.}\\
x&=-\frac{8}{b} &\text{Simplify.}
\end{align*}$$
