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-3x=12+4y
Add 4y to both sides.
-3x=4y+12
The equation is in standard form.
\frac{-3x}{-3}=\frac{4y+12}{-3}
Divide both sides by -3.
x=\frac{4y+12}{-3}
Dividing by -3 undoes the multiplication by -3.
x=-\frac{4y}{3}-4
Divide 12+4y by -3.
-4y=12+3x
Add 3x to both sides.
-4y=3x+12
The equation is in standard form.
\frac{-4y}{-4}=\frac{3x+12}{-4}
Divide both sides by -4.
y=\frac{3x+12}{-4}
Dividing by -4 undoes the multiplication by -4.
y=-\frac{3x}{4}-3
Divide 12+3x by -4.