$$3(x+1)-5(x-2) = 15$$
Answer
$$ x = -1 $$
Explanation
$$ \begin{aligned} 3(x+1)-5(x-2) &= 15&& \text{simplify left side} \\[1 em]3x+3-(5x-10) &= 15&& \\[1 em]3x+3-5x+10 &= 15&& \\[1 em]-2x+13 &= 15&& \text{ move 13 to the right } \\[1 em]-2x &= 15-13&& \\[1 em]-2x &= 2&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= -\frac{2}{2}&& \\[1 em]x &= -1&& \\[1 em] \end{aligned} $$
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