$$ \begin{aligned} 75 &= \frac{x-91}{2}&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2\cdot75 &= 2 \cdot \frac{x-91}{2}&& \text{cancel out the denominators} \\[1 em]150 &= x-91&& \text{ swap the left and right side of the equation } \\[1 em]x-91 &= 150&& \text{ move -91 to the right } \\[1 em]x &= 150+91&& \\[1 em]x &= 241&& \\[1 em]x &= 241&& \\[1 em] \end{aligned} $$

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