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-3x=y
Add y to both sides. Anything plus zero gives itself.
\frac{-3x}{-3}=\frac{y}{-3}
Divide both sides by -3.
x=\frac{y}{-3}
Dividing by -3 undoes the multiplication by -3.
x=-\frac{y}{3}
Divide y by -3.
-y=3x
Add 3x to both sides. Anything plus zero gives itself.
\frac{-y}{-1}=\frac{3x}{-1}
Divide both sides by -1.
y=\frac{3x}{-1}
Dividing by -1 undoes the multiplication by -1.
y=-3x
Divide 3x by -1.