Question
$$-3 = 2-y$$
Answer
$$ y = 5 $$
Explanation
$$ \begin{aligned} -3 &= 2-y&& \text{ swap the left and right side of the equation } \\[1 em]2-y &= -3&& \text{ move 2 to the right } \\[1 em]-y &= -3-2&& \\[1 em]-y &= -5&& \text{switch signs on both sides} \\[1 em]y &= 5&& \\[1 em] \end{aligned} $$
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