$$-11+\frac{b}{8} = 36$$
Answer
$$ b = 376 $$
Explanation
$$ \begin{aligned} -11+\frac{b}{8} &= 36&& \text{multiply ALL terms by } \color{blue}{ 8 }. \\[1 em]-8\cdot11+8 \cdot \frac{b}{8} &= 8\cdot36&& \text{cancel out the denominators} \\[1 em]-88+b &= 288&& \text{ move -88 to the right } \\[1 em]b &= 288+88&& \\[1 em]b &= 376&& \\[1 em]b &= 376&& \\[1 em] \end{aligned} $$
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