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x+12=3y
Add 3y to both sides. Anything plus zero gives itself.
x=3y-12
Subtract 12 from both sides.
-3y+12=-x
Subtract x from both sides. Anything subtracted from zero gives its negation.
-3y=-x-12
Subtract 12 from both sides.
\frac{-3y}{-3}=\frac{-x-12}{-3}
Divide both sides by -3.
y=\frac{-x-12}{-3}
Dividing by -3 undoes the multiplication by -3.
y=\frac{x}{3}+4
Divide -x-12 by -3.