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x^{2}=x^{2}-24x+144
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-12\right)^{2}.
x^{2}-x^{2}=-24x+144
Subtract x^{2} from both sides.
0=-24x+144
Combine x^{2} and -x^{2} to get 0.
-24x+144=0
Swap sides so that all variable terms are on the left hand side.
-24x=-144
Subtract 144 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-144}{-24}
Divide both sides by -24.
x=6
Divide -144 by -24 to get 6.