$$x-3 = 15$$
Answer
$$ x = 18 $$
Explanation
$$ \begin{aligned} x-3 &= 15&& \text{ move -3 to the right } \\[1 em]x &= 15+3&& \\[1 em]x &= 18&& \\[1 em]x &= 18&& \\[1 em] \end{aligned} $$
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