$$ \begin{aligned} \frac{2560}{5} &= 500+x&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5\cdot\frac{2560}{5} &= 5\cdot500+5x&& \text{cancel out the denominators} \\[1 em]2560 &= 2500+5x&& \text{ swap the left and right side of the equation } \\[1 em]2500+5x &= 2560&& \text{ move 2500 to the right } \\[1 em]5x &= 2560-2500&& \\[1 em]5x &= 60&& \text{ divide both sides by $ 5 $ } \\[1 em]x &= \frac{60}{5}&& \\[1 em]x &= 12&& \\[1 em] \end{aligned} $$

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