$$ \begin{aligned} -b &= 2-4(b+8)&& \text{simplify right side} \\[1 em]-b &= 2-(4b+32)&& \\[1 em]-b &= 2-4b-32&& \\[1 em]-b &= -4b-30&& \text{move the $ \color{blue}{ -4b } $ to the left side} \\[1 em]-b+4b &= -30&& \text{simplify left side} \\[1 em]3b &= -30&& \text{ divide both sides by $ 3 $ } \\[1 em]b &= -\frac{30}{3}&& \\[1 em]b &= -10&& \\[1 em] \end{aligned} $$

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