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-10x^4+20x^2+12x

= x(-10x^3 + 20x +12)

x( 20x - 10x^3 + 12)

20x( x - 1/2x^3 +6/10 )

Factor out X by putting it outside the bracket and dividing each vaiablle by x

division means power of x is subtracted by one.

divide by 20

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