ADD 2xcube-9xsquare+8,3xsquare-6x-5,7xcube-10x+1 and 3=2x-5xsquare -4xcube
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(2x 3−9x 2+8)+(3x 2 −6x−5)+(7x 3−10x+1)+(3+2x−5x2 −4x 3 )
=2x 3+7x 3−4x 3−9x 2 −5x 2 +3x−6x−10x+2x+8−5+1+3
=5x 3 −11x 2 −14x+7
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