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x^{2}+x-12-2\left(3x-2\right)=\left(x-4\right)^{2}
Use the distributive property to multiply x-3 by x+4 and combine like terms.
x^{2}+x-12-6x+4=\left(x-4\right)^{2}
Use the distributive property to multiply -2 by 3x-2.
x^{2}-5x-12+4=\left(x-4\right)^{2}
Combine x and -6x to get -5x.
x^{2}-5x-8=\left(x-4\right)^{2}
Add -12 and 4 to get -8.
x^{2}-5x-8=x^{2}-8x+16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-4\right)^{2}.
x^{2}-5x-8-x^{2}=-8x+16
Subtract x^{2} from both sides.
-5x-8=-8x+16
Combine x^{2} and -x^{2} to get 0.
-5x-8+8x=16
Add 8x to both sides.
3x-8=16
Combine -5x and 8x to get 3x.
3x=16+8
Add 8 to both sides.
3x=24
Add 16 and 8 to get 24.
x=\frac{24}{3}
Divide both sides by 3.
x=8
Divide 24 by 3 to get 8.