Question
$$5+2x = -7+3x$$
Answer
$$ x = 12 $$
Explanation
$$ \begin{aligned} 5+2x &= -7+3x&& \text{move the $ \color{blue}{ 3x } $ to the left side and $ \color{blue}{ 5 }$ to the right} \\[1 em]2x-3x &= -7-5&& \text{simplify left and right hand side} \\[1 em]-x &= -12&& \text{switch signs on both sides} \\[1 em]x &= 12&& \\[1 em] \end{aligned} $$
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