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b. 2x²+10x-2x-10=2x²+8x-10
c. x³-4x+20x-5x²+20-100=x³+16x-5x²-80
b.4x"+10x-2x-10=4x"+8x-10
c.x^-2+20x-5x^-3-100=-4x^-5+20x-100