Solve for q
q=\frac{5-p}{2}
Solve for p
p=5-2q
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2q=5-p
Subtract p from both sides.
\frac{2q}{2}=\frac{5-p}{2}
Divide both sides by 2.
q=\frac{5-p}{2}
Dividing by 2 undoes the multiplication by 2.
p=5-2q
Subtract 2q from both sides.
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