Subtract:

(3g - 4) - 2(3g + 4)

To solve the subtraction problem, we need to distribute the -2 to both terms inside the parentheses:

(3g - 4) - 2(3g + 4)
= 3g - 4 - 6g - 8

Next, we can combine like terms by adding the coefficients of the g terms and the constant terms separately:

= (3g - 6g) + (-4 - 8)
= -3g - 12

So, the subtraction of (3g - 4) - 2(3g + 4) is -3g - 12.