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2\left(x^{2}-20x+100\right)-3\left(x-4\right)=2x^{2}-4\left(x-5\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-10\right)^{2}.
2x^{2}-40x+200-3\left(x-4\right)=2x^{2}-4\left(x-5\right)
Use the distributive property to multiply 2 by x^{2}-20x+100.
2x^{2}-40x+200-3x+12=2x^{2}-4\left(x-5\right)
Use the distributive property to multiply -3 by x-4.
2x^{2}-43x+200+12=2x^{2}-4\left(x-5\right)
Combine -40x and -3x to get -43x.
2x^{2}-43x+212=2x^{2}-4\left(x-5\right)
Add 200 and 12 to get 212.
2x^{2}-43x+212=2x^{2}-4x+20
Use the distributive property to multiply -4 by x-5.
2x^{2}-43x+212-2x^{2}=-4x+20
Subtract 2x^{2} from both sides.
-43x+212=-4x+20
Combine 2x^{2} and -2x^{2} to get 0.
-43x+212+4x=20
Add 4x to both sides.
-39x+212=20
Combine -43x and 4x to get -39x.
-39x=20-212
Subtract 212 from both sides.
-39x=-192
Subtract 212 from 20 to get -192.
x=\frac{-192}{-39}
Divide both sides by -39.
x=\frac{64}{13}
Reduce the fraction \frac{-192}{-39} to lowest terms by extracting and canceling out -3.