Solve for N
N=\frac{P-1800}{20}
Solve for P
P=20\left(N+90\right)
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20N+1800=P
Swap sides so that all variable terms are on the left hand side.
20N=P-1800
Subtract 1800 from both sides.
\frac{20N}{20}=\frac{P-1800}{20}
Divide both sides by 20.
N=\frac{P-1800}{20}
Dividing by 20 undoes the multiplication by 20.
N=\frac{P}{20}-90
Divide P-1800 by 20.
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