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8x^{3}+12x^{2}+6x+1+5
Use binomial theorem \left(a+b\right)^{3}=a^{3}+3a^{2}b+3ab^{2}+b^{3} to expand \left(2x+1\right)^{3}.
8x^{3}+12x^{2}+6x+6
Add 1 and 5 to get 6.
8x^{3}+12x^{2}+6x+1+5
Use binomial theorem \left(a+b\right)^{3}=a^{3}+3a^{2}b+3ab^{2}+b^{3} to expand \left(2x+1\right)^{3}.
8x^{3}+12x^{2}+6x+6
Add 1 and 5 to get 6.