$$\frac{d}{11}-4 = -13$$
Answer
$$ d = -99 $$
Explanation
$$ \begin{aligned} \frac{d}{11}-4 &= -13&& \text{multiply ALL terms by } \color{blue}{ 11 }. \\[1 em]11 \cdot \frac{d}{11}-11\cdot4 &= 11\cdot(-13)&& \text{cancel out the denominators} \\[1 em]d-44 &= -143&& \text{ move -44 to the right } \\[1 em]d &= -143+44&& \\[1 em]d &= -99&& \\[1 em]d &= -99&& \\[1 em] \end{aligned} $$
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