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24x-12x²-6+3x
=12x²+27x-6

x²+7x-2x-14+x²
=2x²+5x-14

2x²+3x-x²-12+4x
=x²+7x-12

x²-x-3x-3
=x²-4x-3

-x²-3x-2x+6+3x²
=2x²-5x+6

A= (4x-2)(6-3x)
=24x-12x²-12+6x
=-12x²+30x-12
= 6(-2x²+5x-2)

B= (x-2)(x+7)+x²
=x²+7x-2x-14+x²
=2x²+5x-14

C= 2x²+(x-4)(3-x)
=2x²+3x-x²-12+4x
=x²+7x-12

D=x(x-1)-3(x+1)
=x²-x-3x-3
=x²-4x-3

E= (x+2)(-x-3)+3x²
= -x²-3x-2x-6+3x²
=2x²-5x-6