Question
$$-5(9a+7) = -17$$
Answer
$$ a = -\dfrac{2}{5} $$
Explanation
$$ \begin{aligned} -5(9a+7) &= -17&& \text{simplify left side} \\[1 em]-(45a+35) &= -17&& \\[1 em]-45a-35 &= -17&& \text{ move -35 to the right } \\[1 em]-45a &= -17+35&& \\[1 em]-45a &= 18&& \text{ divide both sides by $ -45 $ } \\[1 em]a &= -\frac{18}{45}&& \\[1 em]a &= -\frac{2}{5}&& \\[1 em] \end{aligned} $$
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