Let's first solve the equation step by step.

Start by distributing the 4 in the first equation:
4(3x + 4) - 5 = -15

This becomes:
12x + 16 - 5 = -15

Combine like terms:
12x + 11 = -15

Subtract 11 from both sides:
12x = -26

Divide by 12 to solve for x:
x = -26/12
x = -13/6

Now let's solve the second part of the equation:

Start by distributing the 4 in the equation:
4(3x + 5) = 2x-5

This becomes:
12x + 20 = 2x - 5

Move all terms to one side of the equation:
12x - 2x = - 5 - 20

Combine like terms:
10x = -25

Divide by 10 to solve for x:
x = -25/10
x = -5/2

So the solution for the equation 4(3x+4)-5=-15 and 4(3x+5)=2x-5 is x = -13/6 and x = -5/2 respectively.