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8x³-12x²+6x-1-x²+4x-4=8x³-13x²+10x-5
b)(x+5)^2-3(x+1)(x-7)+(x-3)^3
x²+10x+25-3(x²-7x+x-7)+x³-9x²+27x-27=x³-8x²+37x-2-3x²+18x+21=x³-11x²+55x+19²