Solve for x
x=\frac{y-85}{18}
Solve for y
y=18x+85
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18x+85=y
Swap sides so that all variable terms are on the left hand side.
18x=y-85
Subtract 85 from both sides.
\frac{18x}{18}=\frac{y-85}{18}
Divide both sides by 18.
x=\frac{y-85}{18}
Dividing by 18 undoes the multiplication by 18.
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