$$0 = 4+\frac{n}{5}$$

$$ \begin{aligned} 0 &= 4+\frac{n}{5}&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5\cdot0 &= 5\cdot4+5 \cdot \frac{n}{5}&& \text{cancel out the denominators} \\[1 em]0 &= 20+n&& \text{ swap the left and right side of the equation } \\[1 em]20+n &= 0&& \text{ move the constants to the right } \\[1 em]n &= -20&& \\[1 em]n &= -20&& \\[1 em] \end{aligned} $$

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