Solve for q
q=\frac{P-4r}{4}
Solve for P
P=4\left(q+r\right)
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P=4q+4r
Use the distributive property to multiply 4 by q+r.
4q+4r=P
Swap sides so that all variable terms are on the left hand side.
4q=P-4r
Subtract 4r from both sides.
\frac{4q}{4}=\frac{P-4r}{4}
Divide both sides by 4.
q=\frac{P-4r}{4}
Dividing by 4 undoes the multiplication by 4.
q=\frac{P}{4}-r
Divide P-4r by 4.
P=4q+4r
Use the distributive property to multiply 4 by q+r.
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Limits
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