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20x=300-30y
Subtract 30y from both sides.
\frac{20x}{20}=\frac{300-30y}{20}
Divide both sides by 20.
x=\frac{300-30y}{20}
Dividing by 20 undoes the multiplication by 20.
x=-\frac{3y}{2}+15
Divide 300-30y by 20.
30y=300-20x
Subtract 20x from both sides.
\frac{30y}{30}=\frac{300-20x}{30}
Divide both sides by 30.
y=\frac{300-20x}{30}
Dividing by 30 undoes the multiplication by 30.
y=-\frac{2x}{3}+10
Divide 300-20x by 30.