$$3x+3 = -2x-17$$
Answer
$$ x = -4 $$
Explanation
$$ \begin{aligned} 3x+3 &= -2x-17&& \text{move the $ \color{blue}{ -2x } $ to the left side and $ \color{blue}{ 3 }$ to the right} \\[1 em]3x+2x &= -17-3&& \text{simplify left and right hand side} \\[1 em]5x &= -20&& \text{ divide both sides by $ 5 $ } \\[1 em]x &= -\frac{20}{5}&& \\[1 em]x &= -4&& \\[1 em] \end{aligned} $$
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