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9x^{2}-12x+4-3\left(x-1\right)=\left(3x+1\right)\left(3x-1\right)-1
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-2\right)^{2}.
9x^{2}-12x+4-3x+3=\left(3x+1\right)\left(3x-1\right)-1
Use the distributive property to multiply -3 by x-1.
9x^{2}-15x+4+3=\left(3x+1\right)\left(3x-1\right)-1
Combine -12x and -3x to get -15x.
9x^{2}-15x+7=\left(3x+1\right)\left(3x-1\right)-1
Add 4 and 3 to get 7.
9x^{2}-15x+7=\left(3x\right)^{2}-1-1
Consider \left(3x+1\right)\left(3x-1\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Square 1.
9x^{2}-15x+7=3^{2}x^{2}-1-1
Expand \left(3x\right)^{2}.
9x^{2}-15x+7=9x^{2}-1-1
Calculate 3 to the power of 2 and get 9.
9x^{2}-15x+7=9x^{2}-2
Subtract 1 from -1 to get -2.
9x^{2}-15x+7-9x^{2}=-2
Subtract 9x^{2} from both sides.
-15x+7=-2
Combine 9x^{2} and -9x^{2} to get 0.
-15x=-2-7
Subtract 7 from both sides.
-15x=-9
Subtract 7 from -2 to get -9.
x=\frac{-9}{-15}
Divide both sides by -15.
x=\frac{3}{5}
Reduce the fraction \frac{-9}{-15} to lowest terms by extracting and canceling out -3.