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-3x=18+3y
Add 3y to both sides.
-3x=3y+18
The equation is in standard form.
\frac{-3x}{-3}=\frac{3y+18}{-3}
Divide both sides by -3.
x=\frac{3y+18}{-3}
Dividing by -3 undoes the multiplication by -3.
x=-\left(y+6\right)
Divide 18+3y by -3.
-3y=18+3x
Add 3x to both sides.
-3y=3x+18
The equation is in standard form.
\frac{-3y}{-3}=\frac{3x+18}{-3}
Divide both sides by -3.
y=\frac{3x+18}{-3}
Dividing by -3 undoes the multiplication by -3.
y=-\left(x+6\right)
Divide 18+3x by -3.