Solve for q
q=\frac{P-10}{2}
Solve for P
P=2\left(q+5\right)
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2q+10=P
Swap sides so that all variable terms are on the left hand side.
2q=P-10
Subtract 10 from both sides.
\frac{2q}{2}=\frac{P-10}{2}
Divide both sides by 2.
q=\frac{P-10}{2}
Dividing by 2 undoes the multiplication by 2.
q=\frac{P}{2}-5
Divide P-10 by 2.
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