$$4n = -36n\cdot2-81n\cdot3$$
Answer
$$ n = 0 $$
Explanation
$$ \begin{aligned} 4n &= -36n\cdot2-81n\cdot3&& \text{simplify right side} \\[1 em]4n &= -72n-243n&& \\[1 em]4n &= -315n&& \text{move the $ \color{blue}{ -315n } $ to the left side} \\[1 em]4n+315n &= 0&& \text{simplify left side} \\[1 em]319n &= 0&& \text{ divide both sides by $ 319 $ } \\[1 em]n &= \frac{0}{319}&& \\[1 em]n &= 0&& \\[1 em] \end{aligned} $$
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