$$ \begin{aligned} \frac{4}{2}\cdot(3-1)+1 &= x&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{4}{2}\cdot(3-1)+2\cdot1 &= 2x&& \text{cancel out the denominators} \\[1 em]8+2 &= 2x&& \text{simplify left side} \\[1 em]10 &= 2x&& \text{ swap the left and right side of the equation } \\[1 em]2x &= 10&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= \frac{10}{2}&& \\[1 em]x &= 5&& \\[1 em] \end{aligned} $$

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