$$ \begin{aligned} \frac{x+30}{2} &= 15&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{x+30}{2} &= 2\cdot15&& \text{cancel out the denominators} \\[1 em]x+30 &= 30&& \text{ move 30 to the right } \\[1 em]x &= 30-30&& \\[1 em]x &= 0&& \text{ divide both sides by $ 1 $ } \\[1 em]x &= \frac{0}{1}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$

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