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Given an equation of the form $a/b=c$, how do you move $a$, the numerator, over to the other side so that you get $b =c?$ (where $?$ denotes my ignorance of what the right side should look like).

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up vote 14 down vote accepted

$$\begin{align*} a/b &= c\\ a &= bc\\ b &= a/c \end{align*}$$

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