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y=-4x
Combine 3x and -7x to get -4x.
-4x=y
Swap sides so that all variable terms are on the left hand side.
\frac{-4x}{-4}=\frac{y}{-4}
Divide both sides by -4.
x=\frac{y}{-4}
Dividing by -4 undoes the multiplication by -4.
x=-\frac{y}{4}
Divide y by -4.
y=-4x
Combine 3x and -7x to get -4x.