$$ \begin{aligned} 1 &= \frac{1}{2}\frac{x^1}{10}&& \text{multiply ALL terms by } \color{blue}{ 10 }. \\[1 em]10\cdot1 &= 10 \cdot \frac{1}{2}\frac{x^1}{10}&& \text{cancel out the denominators} \\[1 em]10 &= \frac{1}{2}x^1&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2\cdot10 &= 2 \cdot \frac{1}{2}x^1&& \text{cancel out the denominators} \\[1 em]20 &= x&& \text{ swap the left and right side of the equation } \\[1 em]x &= 20&& \\[1 em]x &= 20&& \\[1 em] \end{aligned} $$

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