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x^{2}+64=\left(16-x\right)^{2}
Calculate 8 to the power of 2 and get 64.
x^{2}+64=256-32x+x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(16-x\right)^{2}.
x^{2}+64+32x=256+x^{2}
Add 32x to both sides.
x^{2}+64+32x-x^{2}=256
Subtract x^{2} from both sides.
64+32x=256
Combine x^{2} and -x^{2} to get 0.
32x=256-64
Subtract 64 from both sides.
32x=192
Subtract 64 from 256 to get 192.
x=\frac{192}{32}
Divide both sides by 32.
x=6
Divide 192 by 32 to get 6.