$$\frac{3d\cdot3-7d\cdot2-264d-132}{d+8} = 0$$

$$ \begin{aligned} \frac{3d\cdot3-7d\cdot2-264d-132}{d+8} &= 0&& \text{multiply ALL terms by } \color{blue}{ d+8 }. \\[1 em](d+8)\frac{3d\cdot3-7d\cdot2-264d-132}{d+8} &= (d+8)\cdot0&& \text{cancel out the denominators} \\[1 em]-269d-132 &= 0&& \text{ move the constants to the right } \\[1 em]-269d &= 132&& \text{ divide both sides by $ -269 $ } \\[1 em]d &= -\frac{132}{269}&& \\[1 em] \end{aligned} $$

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