Solve for p
p=\frac{Q_{s}-20}{75}
Solve for Q_s
Q_{s}=75p+20
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20+75p=Q_{s}
Swap sides so that all variable terms are on the left hand side.
75p=Q_{s}-20
Subtract 20 from both sides.
\frac{75p}{75}=\frac{Q_{s}-20}{75}
Divide both sides by 75.
p=\frac{Q_{s}-20}{75}
Dividing by 75 undoes the multiplication by 75.
p=\frac{Q_{s}}{75}-\frac{4}{15}
Divide Q_{s}-20 by 75.
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