$$ \begin{aligned} \frac{138915}{132300} &= x&& \text{multiply ALL terms by } \color{blue}{ 132300 }. \\[1 em]132300\cdot\frac{138915}{132300} &= 132300x&& \text{cancel out the denominators} \\[1 em]138915 &= 132300x&& \text{ swap the left and right side of the equation } \\[1 em]132300x &= 138915&& \text{ divide both sides by $ 132300 $ } \\[1 em]x &= \frac{138915}{132300}&& \\[1 em]x &= \frac{21}{20}&& \\[1 em] \end{aligned} $$

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