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x^{2}+2x+1=x^{2}+5
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.
x^{2}+2x+1-x^{2}=5
Subtract x^{2} from both sides.
2x+1=5
Combine x^{2} and -x^{2} to get 0.
2x=5-1
Subtract 1 from both sides.
2x=4
Subtract 1 from 5 to get 4.
x=\frac{4}{2}
Divide both sides by 2.
x=2
Divide 4 by 2 to get 2.