Solve for d
d=4-p
Solve for p
p=4-d
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2d=8-2p
Subtract 2p from both sides.
\frac{2d}{2}=\frac{8-2p}{2}
Divide both sides by 2.
d=\frac{8-2p}{2}
Dividing by 2 undoes the multiplication by 2.
d=4-p
Divide 8-2p by 2.
2p=8-2d
Subtract 2d from both sides.
\frac{2p}{2}=\frac{8-2d}{2}
Divide both sides by 2.
p=\frac{8-2d}{2}
Dividing by 2 undoes the multiplication by 2.
p=4-d
Divide 8-2d by 2.
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