Solve for x
x=\frac{y-85}{54}
Solve for y
y=54x+85
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54x+85=y
Swap sides so that all variable terms are on the left hand side.
54x=y-85
Subtract 85 from both sides.
\frac{54x}{54}=\frac{y-85}{54}
Divide both sides by 54.
x=\frac{y-85}{54}
Dividing by 54 undoes the multiplication by 54.
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