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4x^{2}-12x+9-\left(3x-2\right)\left(x-1\right)=\left(3-x\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-3\right)^{2}.
4x^{2}-12x+9-\left(3x^{2}-5x+2\right)=\left(3-x\right)^{2}
Use the distributive property to multiply 3x-2 by x-1 and combine like terms.
4x^{2}-12x+9-3x^{2}+5x-2=\left(3-x\right)^{2}
To find the opposite of 3x^{2}-5x+2, find the opposite of each term.
x^{2}-12x+9+5x-2=\left(3-x\right)^{2}
Combine 4x^{2} and -3x^{2} to get x^{2}.
x^{2}-7x+9-2=\left(3-x\right)^{2}
Combine -12x and 5x to get -7x.
x^{2}-7x+7=\left(3-x\right)^{2}
Subtract 2 from 9 to get 7.
x^{2}-7x+7=9-6x+x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3-x\right)^{2}.
x^{2}-7x+7+6x=9+x^{2}
Add 6x to both sides.
x^{2}-x+7=9+x^{2}
Combine -7x and 6x to get -x.
x^{2}-x+7-x^{2}=9
Subtract x^{2} from both sides.
-x+7=9
Combine x^{2} and -x^{2} to get 0.
-x=9-7
Subtract 7 from both sides.
-x=2
Subtract 7 from 9 to get 2.
x=-2
Multiply both sides by -1.