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1+\left(x-2\right)\left(x-1\right)=xx
Variable x cannot be equal to any of the values 0,2 since division by zero is not defined. Multiply both sides of the equation by x\left(x-2\right), the least common multiple of x^{2}-2x,x,x-2.
1+\left(x-2\right)\left(x-1\right)=x^{2}
Multiply x and x to get x^{2}.
1+x^{2}-3x+2=x^{2}
Use the distributive property to multiply x-2 by x-1 and combine like terms.
3+x^{2}-3x=x^{2}
Add 1 and 2 to get 3.
3+x^{2}-3x-x^{2}=0
Subtract x^{2} from both sides.
3-3x=0
Combine x^{2} and -x^{2} to get 0.
-3x=-3
Subtract 3 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-3}{-3}
Divide both sides by -3.
x=1
Divide -3 by -3 to get 1.