Solve for y
y=\frac{x-20}{99}
Solve for x
x=99y+20
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-99y=20-x
Subtract x from both sides.
\frac{-99y}{-99}=\frac{20-x}{-99}
Divide both sides by -99.
y=\frac{20-x}{-99}
Dividing by -99 undoes the multiplication by -99.
y=\frac{x-20}{99}
Divide 20-x by -99.
x=20+99y
Add 99y to both sides.
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Limits
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