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12+3x\times 2\left(x-3\right)=4x\left(1.5x-2\right)
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 12x, the least common multiple of x,4,3.
12+6x\left(x-3\right)=4x\left(1.5x-2\right)
Multiply 3 and 2 to get 6.
12+6x^{2}-18x=4x\left(1.5x-2\right)
Use the distributive property to multiply 6x by x-3.
12+6x^{2}-18x=6x^{2}-8x
Use the distributive property to multiply 4x by 1.5x-2.
12+6x^{2}-18x-6x^{2}=-8x
Subtract 6x^{2} from both sides.
12-18x=-8x
Combine 6x^{2} and -6x^{2} to get 0.
12-18x+8x=0
Add 8x to both sides.
12-10x=0
Combine -18x and 8x to get -10x.
-10x=-12
Subtract 12 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-12}{-10}
Divide both sides by -10.
x=\frac{6}{5}
Reduce the fraction \frac{-12}{-10} to lowest terms by extracting and canceling out -2.