$$17a+22 = -23+2a$$
Answer
$$ a = -3 $$
Explanation
$$ \begin{aligned} 17a+22 &= -23+2a&& \text{move the $ \color{blue}{ 2a } $ to the left side and $ \color{blue}{ 22 }$ to the right} \\[1 em]17a-2a &= -23-22&& \text{simplify left and right hand side} \\[1 em]15a &= -45&& \text{ divide both sides by $ 15 $ } \\[1 em]a &= -\frac{45}{15}&& \\[1 em]a &= -3&& \\[1 em] \end{aligned} $$
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