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-3y=-9-x
Subtract x from both sides.
-3y=-x-9
The equation is in standard form.
\frac{-3y}{-3}=\frac{-x-9}{-3}
Divide both sides by -3.
y=\frac{-x-9}{-3}
Dividing by -3 undoes the multiplication by -3.
y=\frac{x}{3}+3
Divide -9-x by -3.
x=-9+3y
Add 3y to both sides.