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9x=20+2y
Add 2y to both sides.
9x=2y+20
The equation is in standard form.
\frac{9x}{9}=\frac{2y+20}{9}
Divide both sides by 9.
x=\frac{2y+20}{9}
Dividing by 9 undoes the multiplication by 9.
-2y=20-9x
Subtract 9x from both sides.
\frac{-2y}{-2}=\frac{20-9x}{-2}
Divide both sides by -2.
y=\frac{20-9x}{-2}
Dividing by -2 undoes the multiplication by -2.
y=\frac{9x}{2}-10
Divide 20-9x by -2.