Question
$$31 = 5(b-3)$$
Answer
$$ b = \dfrac{46}{5} $$
Explanation
$$ \begin{aligned} 31 &= 5(b-3)&& \text{simplify right side} \\[1 em]31 &= 5b-15&& \text{ swap the left and right side of the equation } \\[1 em]5b-15 &= 31&& \text{ move -15 to the right } \\[1 em]5b &= 31+15&& \\[1 em]5b &= 46&& \text{ divide both sides by $ 5 $ } \\[1 em]b &= \frac{46}{5}&& \\[1 em] \end{aligned} $$
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