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