Check whether the (x+2) whole cube = 2x(x square - 1)
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Answer:
xcube+8+6x(x+2)=2xcube-21
xcube+8+6xsq.+12x=2xcube-21
8+6xsq.+12x+21=2xcube-xcub
xcube-6xsq.-12x-29=0
....
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