(2а-1)(4а^2+2+2а+1) = (2а-1)(4а^2+3+2а) = 8а^3+6а+4а^2-4а^2-3-2а = 8а^3+4а-3
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(2а-1)(4а^2+2+2а+1) = (2а-1)(4а^2+3+2а) = 8а^3+6а+4а^2-4а^2-3-2а = 8а^3+4а-3