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49+\left(12-x\right)^{2}=x^{2}
Calculate 7 to the power of 2 and get 49.
49+144-24x+x^{2}=x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(12-x\right)^{2}.
193-24x+x^{2}=x^{2}
Add 49 and 144 to get 193.
193-24x+x^{2}-x^{2}=0
Subtract x^{2} from both sides.
193-24x=0
Combine x^{2} and -x^{2} to get 0.
-24x=-193
Subtract 193 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-193}{-24}
Divide both sides by -24.
x=\frac{193}{24}
Fraction \frac{-193}{-24} can be simplified to \frac{193}{24} by removing the negative sign from both the numerator and the denominator.