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x^{2}+2x=\left(x-1\right)^{2}-1
Use the distributive property to multiply x by x+2.
x^{2}+2x=x^{2}-2x+1-1
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-1\right)^{2}.
x^{2}+2x=x^{2}-2x
Subtract 1 from 1 to get 0.
x^{2}+2x-x^{2}=-2x
Subtract x^{2} from both sides.
2x=-2x
Combine x^{2} and -x^{2} to get 0.
2x+2x=0
Add 2x to both sides.
4x=0
Combine 2x and 2x to get 4x.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since 4 is not equal to 0, x must be equal to 0.