Question
$$-5(-d+5)-7d = 13$$
Answer
$$ d = -19 $$
Explanation
$$ \begin{aligned} -5(-d+5)-7d &= 13&& \text{simplify left side} \\[1 em]-(-5d+25)-7d &= 13&& \\[1 em]5d-25-7d &= 13&& \\[1 em]-2d-25 &= 13&& \text{ move -25 to the right } \\[1 em]-2d &= 13+25&& \\[1 em]-2d &= 38&& \text{ divide both sides by $ -2 $ } \\[1 em]d &= -\frac{38}{2}&& \\[1 em]d &= -19&& \\[1 em] \end{aligned} $$
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