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6x2+9x-6x3-4x2-10x+2= -6x3+2x2+x+2
ad b)
[3x3+2x2+5x-1+x4-2x3+4x2-7]-6x2-9x= 3x3+2x2+5x-1+x4-2x3+4x2-7-6x2-9x= x4+x3-4x-8