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JuliaKovalchook
3x^2-7x+2=3x^2-x-6x+2=x(3x-1)-2(3x-1)= \= (3x-1)(x-2) \  \ a^2-b^2=(a-b)(a+b) \ 9x^2-1=3^2x^2-1^2=(3x-1)(3x+1)


 frac{3x^2-7x+2}{9x^2-1} = frac{(3x-1)(x-2)}{(3x-1)(3x+1)} = frac{x-2}{3x+1}


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