$$ \begin{aligned} 67 &= n+3n+4+4n-9&& \text{simplify right side} \\[1 em]67 &= 4n+4+4n-9&& \\[1 em]67 &= 8n-5&& \text{ swap the left and right side of the equation } \\[1 em]8n-5 &= 67&& \text{ move -5 to the right } \\[1 em]8n &= 67+5&& \\[1 em]8n &= 72&& \text{ divide both sides by $ 8 $ } \\[1 em]n &= \frac{72}{8}&& \\[1 em]n &= 9&& \\[1 em] \end{aligned} $$

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