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b) 2+x-3x^2-6x-10=-3x^2-5x-8=3x^2+5x+8
c) (2+x-3x^2)×(6x+10)=
12x+20+6x^2+10x-18x^3-30x^2=
-18x^3-24x^2+22x+20=........÷(-2)
9x^3+12x^2-11x-10
d) 6x+10/2=3x+5