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9x=3y-9-9
Subtract 9 from both sides.
9x=3y-18
Subtract 9 from -9 to get -18.
\frac{9x}{9}=\frac{3y-18}{9}
Divide both sides by 9.
x=\frac{3y-18}{9}
Dividing by 9 undoes the multiplication by 9.
x=\frac{y}{3}-2
Divide -18+3y by 9.
3y-9=9x+9
Swap sides so that all variable terms are on the left hand side.
3y=9x+9+9
Add 9 to both sides.
3y=9x+18
Add 9 and 9 to get 18.
\frac{3y}{3}=\frac{9x+18}{3}
Divide both sides by 3.
y=\frac{9x+18}{3}
Dividing by 3 undoes the multiplication by 3.
y=3x+6
Divide 18+9x by 3.