Solve for x
x=\frac{y-20}{3}
Solve for y
y=3x+20
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3x+20=y
Swap sides so that all variable terms are on the left hand side.
3x=y-20
Subtract 20 from both sides.
\frac{3x}{3}=\frac{y-20}{3}
Divide both sides by 3.
x=\frac{y-20}{3}
Dividing by 3 undoes the multiplication by 3.
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