Solve for p
p=-\frac{D}{150}+\frac{1}{3}
Solve for D
D=50-150p
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50-150p=D
Swap sides so that all variable terms are on the left hand side.
-150p=D-50
Subtract 50 from both sides.
\frac{-150p}{-150}=\frac{D-50}{-150}
Divide both sides by -150.
p=\frac{D-50}{-150}
Dividing by -150 undoes the multiplication by -150.
p=-\frac{D}{150}+\frac{1}{3}
Divide D-50 by -150.
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