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x+y-2x=-3y
Subtract 2x from both sides.
-x+y=-3y
Combine x and -2x to get -x.
-x=-3y-y
Subtract y from both sides.
-x=-4y
Combine -3y and -y to get -4y.
\frac{-x}{-1}=-\frac{4y}{-1}
Divide both sides by -1.
x=-\frac{4y}{-1}
Dividing by -1 undoes the multiplication by -1.
x=4y
Divide -4y by -1.
x+y+3y=2x
Add 3y to both sides.
x+4y=2x
Combine y and 3y to get 4y.
4y=2x-x
Subtract x from both sides.
4y=x
Combine 2x and -x to get x.
\frac{4y}{4}=\frac{x}{4}
Divide both sides by 4.
y=\frac{x}{4}
Dividing by 4 undoes the multiplication by 4.