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x^{2}+2x=x\left(x+3\right)
Use the distributive property to multiply x by x+2.
x^{2}+2x=x^{2}+3x
Use the distributive property to multiply x by x+3.
x^{2}+2x-x^{2}=3x
Subtract x^{2} from both sides.
2x=3x
Combine x^{2} and -x^{2} to get 0.
2x-3x=0
Subtract 3x from both sides.
-x=0
Combine 2x and -3x to get -x.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -1 is not equal to 0, x must be equal to 0.