To solve the first equation 2,7+1,9=2x+1,5, we need to add the decimals on the left side and set it equal to 2x+1.5 on the right side.

2.7 + 1.9 = 4.6
4.6 = 2x + 1.5

Now solve for x:
2x = 4.6 - 1.5
2x = 3.1
x = 3.1 / 2
x = 1.55

So, x = 1.55 for the first equation.

Next, to solve the second equation 13/18x + 13 = 7/12x + 8, we need to simplify it.

Multiply through by the least common multiple (LCM) of 18 and 12 to get rid of the fractions:

12(13/18)x + 12(13) = 18(7/12)x + 18(8)
13(12)x + 156 = 7(18)x + 144
156x + 156 = 126x + 144

Now solve for x:
156x - 126x = 144 - 156
30x = -12
x = -12 / 30
x = -0.4

So, x = -0.4 for the second equation.