Question
$$7+2 = x-3$$
Answer
$$ x = 12 $$
Explanation
$$ \begin{aligned} 7+2 &= x-3&& \text{simplify left side} \\[1 em]9 &= x-3&& \text{ swap the left and right side of the equation } \\[1 em]x-3 &= 9&& \text{ move -3 to the right } \\[1 em]x &= 9+3&& \\[1 em]x &= 12&& \\[1 em]x &= 12&& \\[1 em] \end{aligned} $$
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