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1+9x^{2}-12x+4=\left(x-5\right)\times 9x
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-2\right)^{2}.
5+9x^{2}-12x=\left(x-5\right)\times 9x
Add 1 and 4 to get 5.
5+9x^{2}-12x=\left(9x-45\right)x
Use the distributive property to multiply x-5 by 9.
5+9x^{2}-12x=9x^{2}-45x
Use the distributive property to multiply 9x-45 by x.
5+9x^{2}-12x-9x^{2}=-45x
Subtract 9x^{2} from both sides.
5-12x=-45x
Combine 9x^{2} and -9x^{2} to get 0.
5-12x+45x=0
Add 45x to both sides.
5+33x=0
Combine -12x and 45x to get 33x.
33x=-5
Subtract 5 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-5}{33}
Divide both sides by 33.
x=-\frac{5}{33}
Fraction \frac{-5}{33} can be rewritten as -\frac{5}{33} by extracting the negative sign.