What is the product? 6(x*2-1)(6x-1/6(x+1))

(x-1)(6x-1)

The number is not fully separated so the question might be interpreted in many ways. I will solve this based on assumption that the question is {6(x^2-1)(6x-1)}/{6(x+1)}

{6 (x^2-1) (6x-1)}   /   {6(x+1)}
{(x^2-1)(6x-1)}   /   {(x+1)}             > divide both by 6
{(x-1)(x+1)(6x-1)}   /   {(x+1)}           > (x^2-1) = (x-1)(x+1)
{(x-1)(6x-1)}   /   {1}                        > divide both by (x+1)

Result: (x-1)(6x-1)

The answer is 41.7 because 1.39 times 30 is 41.7