$$\frac{18}{a} = -3$$

$$ \begin{aligned} \frac{18}{a} &= -3&& \text{multiply ALL terms by } \color{blue}{ a }. \\[1 em]a\cdot\frac{18}{a} &= a\cdot(-3)&& \text{cancel out the denominators} \\[1 em]18 &= -3a&& \text{ swap the left and right side of the equation } \\[1 em]-3a &= 18&& \text{ divide both sides by $ -3 $ } \\[1 em]a &= -\frac{18}{3}&& \\[1 em]a &= -6&& \\[1 em] \end{aligned} $$

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