Question
$$-84\cdot(8-2x) = 0$$
Answer
$$ x = 4 $$
Explanation
$$ \begin{aligned} -84\cdot(8-2x) &= 0&& \text{simplify left side} \\[1 em]-(672-168x) &= 0&& \\[1 em]-672+168x &= 0&& \\[1 em]168x-672 &= 0&& \text{ move the constants to the right } \\[1 em]168x &= 672&& \text{ divide both sides by $ 168 $ } \\[1 em]x &= \frac{672}{168}&& \\[1 em]x &= 4&& \\[1 em] \end{aligned} $$
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