Question
$$9n+4 = 5n+18$$
Answer
$$ n = \dfrac{7}{2} $$
Explanation
$$ \begin{aligned} 9n+4 &= 5n+18&& \text{move the $ \color{blue}{ 5n } $ to the left side and $ \color{blue}{ 4 }$ to the right} \\[1 em]9n-5n &= 18-4&& \text{simplify left and right hand side} \\[1 em]4n &= 14&& \text{ divide both sides by $ 4 $ } \\[1 em]n &= \frac{14}{4}&& \\[1 em]n &= \frac{7}{2}&& \\[1 em] \end{aligned} $$
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