Solve for q
q=\frac{r-p}{4}
Solve for p
p=r-4q
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-4q+r=p
Swap sides so that all variable terms are on the left hand side.
-4q=p-r
Subtract r from both sides.
\frac{-4q}{-4}=\frac{p-r}{-4}
Divide both sides by -4.
q=\frac{p-r}{-4}
Dividing by -4 undoes the multiplication by -4.
q=\frac{r-p}{4}
Divide p-r by -4.
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