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3a+12-6+6a=9a+6
b)
2x^3+6x-3x^2-9
c)
(x+1)(x^2+3x-2x-6)=(x+1)(x^2+x-6)=x^3+x^2-6x+x^2+x-6=x^3+2x^2-5x-6