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x^{2}-10x+25=\left(x+3\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-5\right)^{2}.
x^{2}-10x+25=x^{2}+6x+9
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
x^{2}-10x+25-x^{2}=6x+9
Subtract x^{2} from both sides.
-10x+25=6x+9
Combine x^{2} and -x^{2} to get 0.
-10x+25-6x=9
Subtract 6x from both sides.
-16x+25=9
Combine -10x and -6x to get -16x.
-16x=9-25
Subtract 25 from both sides.
-16x=-16
Subtract 25 from 9 to get -16.
x=\frac{-16}{-16}
Divide both sides by -16.
x=1
Divide -16 by -16 to get 1.