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12x-12-3\left(3x-3\right)=7
Use the distributive property to multiply 4 by 3x-3.
12x-12-9x+9=7
Use the distributive property to multiply -3 by 3x-3.
3x-12+9=7
Combine 12x and -9x to get 3x.
3x-3=7
Add -12 and 9 to get -3.
3x=7+3
Add 3 to both sides.
3x=10
Add 7 and 3 to get 10.
x=\frac{10}{3}
Divide both sides by 3.