To solve this equation, we need to isolate the variable x.

First, we simplify the equation:

25 + x = 4 + 136 * 15

25 + x = 4 + 2040

Next, combine like terms:

25 + x = 2044

Now, isolate the variable x by moving 25 to the other side of the equation:

x = 2044 - 25
x = 2019

Therefore, the solution to the equation (25+x) : 15 = 4 + 136 is x = 2019.