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\left(x-2\right)\left(3x+6\right)-3\times 4x=x\times 3\left(x-2\right)
Variable x cannot be equal to 2 since division by zero is not defined. Multiply both sides of the equation by 3\left(x-2\right), the least common multiple of 3,x-2.
3x^{2}-12-3\times 4x=x\times 3\left(x-2\right)
Use the distributive property to multiply x-2 by 3x+6 and combine like terms.
3x^{2}-12-12x=x\times 3\left(x-2\right)
Multiply -3 and 4 to get -12.
3x^{2}-12-12x=3x^{2}-2x\times 3
Use the distributive property to multiply x\times 3 by x-2.
3x^{2}-12-12x=3x^{2}-6x
Multiply -2 and 3 to get -6.
3x^{2}-12-12x-3x^{2}=-6x
Subtract 3x^{2} from both sides.
-12-12x=-6x
Combine 3x^{2} and -3x^{2} to get 0.
-12-12x+6x=0
Add 6x to both sides.
-12-6x=0
Combine -12x and 6x to get -6x.
-6x=12
Add 12 to both sides. Anything plus zero gives itself.
x=\frac{12}{-6}
Divide both sides by -6.
x=-2
Divide 12 by -6 to get -2.