Question
$$7+\frac{b}{4} = 11$$
Answer
$$ b = 16 $$
Explanation
$$ \begin{aligned} 7+\frac{b}{4} &= 11&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4\cdot7+4 \cdot \frac{b}{4} &= 4\cdot11&& \text{cancel out the denominators} \\[1 em]28+b &= 44&& \text{ move 28 to the right } \\[1 em]b &= 44-28&& \\[1 em]b &= 16&& \\[1 em]b &= 16&& \\[1 em] \end{aligned} $$
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