Solve for P
P=-\frac{8D}{5}+64
Solve for D
D=-\frac{5P}{8}+40
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40-\frac{5P}{8}=D
Swap sides so that all variable terms are on the left hand side.
-\frac{5P}{8}=D-40
Subtract 40 from both sides.
-5P=8D-320
Multiply both sides of the equation by 8.
\frac{-5P}{-5}=\frac{8D-320}{-5}
Divide both sides by -5.
P=\frac{8D-320}{-5}
Dividing by -5 undoes the multiplication by -5.
P=-\frac{8D}{5}+64
Divide -320+8D by -5.
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