Expanding the left side of the equation:

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

Combining like terms:

-6x - 8 + 6x + 8 = 0

Expanding the right side of the equation:

4(5x - 2) = 20x - 8
-5x - 8

Combining like terms:

20x - 8 - 5x - 8 = 15x - 16

So the equation becomes:

15x - 16 = 0

Adding 16 to both sides:

15x = 16

Dividing by 15:

x = 16/15

Therefore, the solution is x = 16/15.