Question
$$12 = 6(n-7)$$
Answer
$$ n = 9 $$
Explanation
$$ \begin{aligned} 12 &= 6(n-7)&& \text{simplify right side} \\[1 em]12 &= 6n-42&& \text{ swap the left and right side of the equation } \\[1 em]6n-42 &= 12&& \text{ move -42 to the right } \\[1 em]6n &= 12+42&& \\[1 em]6n &= 54&& \text{ divide both sides by $ 6 $ } \\[1 em]n &= \frac{54}{6}&& \\[1 em]n &= 9&& \\[1 em] \end{aligned} $$
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