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3+xx+x\left(-1\right)=xx
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by x.
3+x^{2}+x\left(-1\right)=xx
Multiply x and x to get x^{2}.
3+x^{2}+x\left(-1\right)=x^{2}
Multiply x and x to get x^{2}.
3+x^{2}+x\left(-1\right)-x^{2}=0
Subtract x^{2} from both sides.
3+x\left(-1\right)=0
Combine x^{2} and -x^{2} to get 0.
x\left(-1\right)=-3
Subtract 3 from both sides. Anything subtracted from zero gives its negation.
x=3
Multiply both sides by -1.