Question
$$7n+3 = 11n+39$$
Answer
$$ n = -9 $$
Explanation
$$ \begin{aligned} 7n+3 &= 11n+39&& \text{move the $ \color{blue}{ 11n } $ to the left side and $ \color{blue}{ 3 }$ to the right} \\[1 em]7n-11n &= 39-3&& \text{simplify left and right hand side} \\[1 em]-4n &= 36&& \text{ divide both sides by $ -4 $ } \\[1 em]n &= -\frac{36}{4}&& \\[1 em]n &= -9&& \\[1 em] \end{aligned} $$
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