Question
$$39 = 28-b$$
Answer
$$ b = -11 $$
Explanation
$$ \begin{aligned} 39 &= 28-b&& \text{ swap the left and right side of the equation } \\[1 em]28-b &= 39&& \text{ move 28 to the right } \\[1 em]-b &= 39-28&& \\[1 em]-b &= 11&& \text{switch signs on both sides} \\[1 em]b &= -11&& \\[1 em] \end{aligned} $$
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