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\left(x-1\right)x=\left(x-1\right)\left(x+3\right)+\left(x+3\right)\times 2
Variable x cannot be equal to any of the values -3,1 since division by zero is not defined. Multiply both sides of the equation by \left(x-1\right)\left(x+3\right), the least common multiple of x+3,x-1.
x^{2}-x=\left(x-1\right)\left(x+3\right)+\left(x+3\right)\times 2
Use the distributive property to multiply x-1 by x.
x^{2}-x=x^{2}+2x-3+\left(x+3\right)\times 2
Use the distributive property to multiply x-1 by x+3 and combine like terms.
x^{2}-x=x^{2}+2x-3+2x+6
Use the distributive property to multiply x+3 by 2.
x^{2}-x=x^{2}+4x-3+6
Combine 2x and 2x to get 4x.
x^{2}-x=x^{2}+4x+3
Add -3 and 6 to get 3.
x^{2}-x-x^{2}=4x+3
Subtract x^{2} from both sides.
-x=4x+3
Combine x^{2} and -x^{2} to get 0.
-x-4x=3
Subtract 4x from both sides.
-5x=3
Combine -x and -4x to get -5x.
x=\frac{3}{-5}
Divide both sides by -5.
x=-\frac{3}{5}
Fraction \frac{3}{-5} can be rewritten as -\frac{3}{5} by extracting the negative sign.