Solve for N
N=\frac{P-1900}{120}
Solve for P
P=120N+1900
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1900+120N=P
Swap sides so that all variable terms are on the left hand side.
120N=P-1900
Subtract 1900 from both sides.
\frac{120N}{120}=\frac{P-1900}{120}
Divide both sides by 120.
N=\frac{P-1900}{120}
Dividing by 120 undoes the multiplication by 120.
N=\frac{P}{120}-\frac{95}{6}
Divide P-1900 by 120.
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