$$-20 = \frac{y}{4}-8$$

$$ \begin{aligned} -20 &= \frac{y}{4}-8&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4\cdot(-20) &= 4 \cdot \frac{y}{4}-4\cdot8&& \text{cancel out the denominators} \\[1 em]-80 &= y-32&& \text{ swap the left and right side of the equation } \\[1 em]y-32 &= -80&& \text{ move -32 to the right } \\[1 em]y &= -80+32&& \\[1 em]y &= -48&& \\[1 em]y &= -48&& \\[1 em] \end{aligned} $$

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