Question
$$7-2(y+1) = 15$$
Answer
$$ y = -5 $$
Explanation
$$ \begin{aligned} 7-2(y+1) &= 15&& \text{simplify left side} \\[1 em]7-(2y+2) &= 15&& \\[1 em]7-2y-2 &= 15&& \\[1 em]-2y+5 &= 15&& \text{ move 5 to the right } \\[1 em]-2y &= 15-5&& \\[1 em]-2y &= 10&& \text{ divide both sides by $ -2 $ } \\[1 em]y &= -\frac{10}{2}&& \\[1 em]y &= -5&& \\[1 em] \end{aligned} $$
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