How do you factor 7x+28x^2-35x^3?
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7x[1+4x-5x^2]
=-7x[5x^2-4x-1]
-7x[5x^2-5x+x-1]
=-7x[5x(x-1)+1(x-1)]
=-7x(x-1)(5x+1)
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