find and explain the error in the work below.

Multiply: (2x-3)(6x+2)
2x(6x)+2x(2)-3(6x)+3(2)
12x^2+4x-18x+6
12x^2-14x+6

The error in the work is that the terms 2x(2) and 3(2) were not combined. The correct answer should be 12x^2-14x+6.