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=(2x+1)(2x+1)(2x+1)
=4x^2+2x+2x+1(2x+1)
=4x^2+4x+1(2x+1)
=8x^3+8x^2+2x+4x^2+4x+1
=8x^3+12x^2+6x+1
=8+12+6+1=27