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\left(x-3\right)\left(3x+4\right)=\left(x+6\right)\left(3x-2\right)-23x
Variable x cannot be equal to any of the values -6,3 since division by zero is not defined. Multiply both sides of the equation by \left(x-3\right)\left(x+6\right), the least common multiple of x+6,x-3,x^{2}+3x-18.
3x^{2}-5x-12=\left(x+6\right)\left(3x-2\right)-23x
Use the distributive property to multiply x-3 by 3x+4 and combine like terms.
3x^{2}-5x-12=3x^{2}+16x-12-23x
Use the distributive property to multiply x+6 by 3x-2 and combine like terms.
3x^{2}-5x-12=3x^{2}-7x-12
Combine 16x and -23x to get -7x.
3x^{2}-5x-12-3x^{2}=-7x-12
Subtract 3x^{2} from both sides.
-5x-12=-7x-12
Combine 3x^{2} and -3x^{2} to get 0.
-5x-12+7x=-12
Add 7x to both sides.
2x-12=-12
Combine -5x and 7x to get 2x.
2x=-12+12
Add 12 to both sides.
2x=0
Add -12 and 12 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since 2 is not equal to 0, x must be equal to 0.