$$ \begin{aligned} 16+v &= 3v&& \text{move the $ \color{blue}{ 3v } $ to the left side and $ \color{blue}{ 16 }$ to the right} \\[1 em]v-3v &= -16&& \text{simplify left side} \\[1 em]-2v &= -16&& \text{ divide both sides by $ -2 $ } \\[1 em]v &= \frac{-16}{-2}&& \\[1 em]v &= 8&& \\[1 em] \end{aligned} $$
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