Solve for p
p=4\left(d-21\right)
Solve for d
d=\frac{p}{4}+21
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0.25p=d-21
Subtract 21 from both sides.
\frac{0.25p}{0.25}=\frac{d-21}{0.25}
Multiply both sides by 4.
p=\frac{d-21}{0.25}
Dividing by 0.25 undoes the multiplication by 0.25.
p=4d-84
Divide d-21 by 0.25 by multiplying d-21 by the reciprocal of 0.25.
d=21+0.25p
Swap sides so that all variable terms are on the left hand side.
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