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\left(x+5\right)x-\left(x-3\right)\times 8=x^{2}
Variable x cannot be equal to any of the values -5,3 since division by zero is not defined. Multiply both sides of the equation by \left(x-3\right)\left(x+5\right), the least common multiple of x-3,x+5,x^{2}+2x-15.
x^{2}+5x-\left(x-3\right)\times 8=x^{2}
Use the distributive property to multiply x+5 by x.
x^{2}+5x-\left(8x-24\right)=x^{2}
Use the distributive property to multiply x-3 by 8.
x^{2}+5x-8x+24=x^{2}
To find the opposite of 8x-24, find the opposite of each term.
x^{2}-3x+24=x^{2}
Combine 5x and -8x to get -3x.
x^{2}-3x+24-x^{2}=0
Subtract x^{2} from both sides.
-3x+24=0
Combine x^{2} and -x^{2} to get 0.
-3x=-24
Subtract 24 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-24}{-3}
Divide both sides by -3.
x=8
Divide -24 by -3 to get 8.