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b=(4x-5)(2x+3)
c=3x(2x-5)-(2x+1)(x-1)
d=(x+3)( x²-3x+9)
E=3a²b(4a-3b+5a²b)
F=(5x-2)²-3(3x+4)(2x-3)
G=(3x-5)(3x+5)-3(5x-3)²
H=(5x-3)(25x²+9)(5x+3)
I=(5x+6)²-(7x-3)²​