Question
$$-\frac{b}{5}-27 = 0$$
Answer
$$ b = -135 $$
Explanation
$$ \begin{aligned} -\frac{b}{5}-27 &= 0&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]-5 \cdot \frac{b}{5}-5\cdot27 &= 5\cdot0&& \text{cancel out the denominators} \\[1 em]-b-135 &= 0&& \text{ move the constants to the right } \\[1 em]-b &= 135&& \text{switch signs on both sides} \\[1 em]b &= -135&& \\[1 em] \end{aligned} $$
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