A= 7-(2X+1)+(2X+9)(3+4X)
A=7-2X+7-1+2Xx3+2Xx4X+9x3+9x4X
A=7-2X+6+6X+8X²+27+36X
A=8X²+40X+40
B= (8+3X)(2X-5)+(2X+1)
B=16X-40+6X²-15X+(2X+1)
B=6X²+2X+1+X+2X+1-40+2X+1
B=6X²+7X+43
C=9X-7-8X+2
C=X-5
D=8X³-4+10X³-45X²
D=18X³-45X²-4
E=8X-20+16X-6X²-56+21X
E= -6X²+45X-76
