Solve for P
P=200-Q
Solve for Q
Q=200-P
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200-P=Q
Swap sides so that all variable terms are on the left hand side.
-P=Q-200
Subtract 200 from both sides.
\frac{-P}{-1}=\frac{Q-200}{-1}
Divide both sides by -1.
P=\frac{Q-200}{-1}
Dividing by -1 undoes the multiplication by -1.
P=200-Q
Divide Q-200 by -1.
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