$$6 = \frac{a}{4}+2$$

$$ \begin{aligned} 6 &= \frac{a}{4}+2&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4\cdot6 &= 4 \cdot \frac{a}{4}+4\cdot2&& \text{cancel out the denominators} \\[1 em]24 &= a+8&& \text{ swap the left and right side of the equation } \\[1 em]a+8 &= 24&& \text{ move 8 to the right } \\[1 em]a &= 24-8&& \\[1 em]a &= 16&& \\[1 em]a &= 16&& \\[1 em] \end{aligned} $$

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