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6x-9=3x-12
Use the distributive property to multiply 3 by x-4.
6x-9-3x=-12
Subtract 3x from both sides.
3x-9=-12
Combine 6x and -3x to get 3x.
3x=-12+9
Add 9 to both sides.
3x=-3
Add -12 and 9 to get -3.
x=\frac{-3}{3}
Divide both sides by 3.
x=-1
Divide -3 by 3 to get -1.