Question
$$10-5v = 10-v$$
Answer
$$ v = 0 $$
Explanation
$$ \begin{aligned} 10-5v &= 10-v&& \text{move the $ \color{blue}{ -v } $ to the left side and $ \color{blue}{ 10 }$ to the right} \\[1 em]-5v+v &= 10-10&& \text{simplify left and right hand side} \\[1 em]-4v &= 0&& \text{ divide both sides by $ -4 $ } \\[1 em]v &= \frac{0}{-4}&& \\[1 em]v &= 0&& \\[1 em] \end{aligned} $$
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