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25x^{2}-20x+4=\left(25x+2\right)\left(x-1\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-2\right)^{2}.
25x^{2}-20x+4=25x^{2}-23x-2
Use the distributive property to multiply 25x+2 by x-1 and combine like terms.
25x^{2}-20x+4-25x^{2}=-23x-2
Subtract 25x^{2} from both sides.
-20x+4=-23x-2
Combine 25x^{2} and -25x^{2} to get 0.
-20x+4+23x=-2
Add 23x to both sides.
3x+4=-2
Combine -20x and 23x to get 3x.
3x=-2-4
Subtract 4 from both sides.
3x=-6
Subtract 4 from -2 to get -6.
x=\frac{-6}{3}
Divide both sides by 3.
x=-2
Divide -6 by 3 to get -2.