Question
$$21+3x = -32+2x$$
Answer
$$ x = -53 $$
Explanation
$$ \begin{aligned} 21+3x &= -32+2x&& \text{move the $ \color{blue}{ 2x } $ to the left side and $ \color{blue}{ 21 }$ to the right} \\[1 em]3x-2x &= -32-21&& \text{simplify left and right hand side} \\[1 em]x &= -53&& \\[1 em]x &= -53&& \\[1 em] \end{aligned} $$
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