Answer:
6x^2 - x - 1
Step-by-step explanation:
First distribute the 3x for 3x(2x -1).
(6x^2 - 3x) + (2x-1)
6x^2 - 3x + 2x - 1
(6x-3x)+(2x-1)
3x+2x-1=
5x-1