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\left(x+3\right)x+\left(x+3\right)x\times 3=x^{2}\times 2+\left(x^{2}-9\right)\times 2
Variable x cannot be equal to any of the values -3,0,3 since division by zero is not defined. Multiply both sides of the equation by \left(x-3\right)\left(x+3\right)x^{2}, the least common multiple of x^{2}-3x,x^{2}-9,x^{2}.
x^{2}+3x+\left(x+3\right)x\times 3=x^{2}\times 2+\left(x^{2}-9\right)\times 2
Use the distributive property to multiply x+3 by x.
x^{2}+3x+\left(x^{2}+3x\right)\times 3=x^{2}\times 2+\left(x^{2}-9\right)\times 2
Use the distributive property to multiply x+3 by x.
x^{2}+3x+3x^{2}+9x=x^{2}\times 2+\left(x^{2}-9\right)\times 2
Use the distributive property to multiply x^{2}+3x by 3.
4x^{2}+3x+9x=x^{2}\times 2+\left(x^{2}-9\right)\times 2
Combine x^{2} and 3x^{2} to get 4x^{2}.
4x^{2}+12x=x^{2}\times 2+\left(x^{2}-9\right)\times 2
Combine 3x and 9x to get 12x.
4x^{2}+12x=x^{2}\times 2+2x^{2}-18
Use the distributive property to multiply x^{2}-9 by 2.
4x^{2}+12x=4x^{2}-18
Combine x^{2}\times 2 and 2x^{2} to get 4x^{2}.
4x^{2}+12x-4x^{2}=-18
Subtract 4x^{2} from both sides.
12x=-18
Combine 4x^{2} and -4x^{2} to get 0.
x=\frac{-18}{12}
Divide both sides by 12.
x=-\frac{3}{2}
Reduce the fraction \frac{-18}{12} to lowest terms by extracting and canceling out 6.