Question
$$16+5d = 9d$$
Answer
$$ d = 4 $$
Explanation
$$ \begin{aligned} 16+5d &= 9d&& \text{move the $ \color{blue}{ 9d } $ to the left side and $ \color{blue}{ 16 }$ to the right} \\[1 em]5d-9d &= -16&& \text{simplify left side} \\[1 em]-4d &= -16&& \text{ divide both sides by $ -4 $ } \\[1 em]d &= \frac{-16}{-4}&& \\[1 em]d &= 4&& \\[1 em] \end{aligned} $$
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