Question
$$-v+25 = 4v$$
Answer
$$ v = 5 $$
Explanation
$$ \begin{aligned} -v+25 &= 4v&& \text{move the $ \color{blue}{ 4v } $ to the left side and $ \color{blue}{ 25 }$ to the right} \\[1 em]-v-4v &= -25&& \text{simplify left side} \\[1 em]-5v &= -25&& \text{ divide both sides by $ -5 $ } \\[1 em]v &= \frac{-25}{-5}&& \\[1 em]v &= 5&& \\[1 em] \end{aligned} $$
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