A= 21a²-15a
B= -15x²+20xcube
c=16x²-4x+40x-10=16x²+36x-10
d=12y-3-24y²+6y= -24y²+18y-3
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A= 21a²-15a
B= -15x²+20xcube
c=16x²-4x+40x-10=16x²+36x-10
d=12y-3-24y²+6y= -24y²+18y-3