Question
$$7+2 = x+6$$
Answer
$$ x = 3 $$
Explanation
$$ \begin{aligned} 7+2 &= x+6&& \text{simplify left side} \\[1 em]9 &= x+6&& \text{ swap the left and right side of the equation } \\[1 em]x+6 &= 9&& \text{ move 6 to the right } \\[1 em]x &= 9-6&& \\[1 em]x &= 3&& \\[1 em]x &= 3&& \\[1 em] \end{aligned} $$
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