2(1,2m+5)+4=2m+0,8 ( 2;m )

Expanding the left side:
2(1.2m) + 2(5) + 4 = 2m + 0.8(2)

2.4m + 10 + 4 = 2m + 1.6

Combine like terms:
2.4m + 14 = 2m + 1.6

Subtract 2m from both sides:
0.4m + 14 = 1.6

Subtract 14 from both sides:
0.4m = -12.4

Divide by 0.4 to solve for m:
m = -31

Therefore, the solution to the equation 2(1,2m+5)+4=2m+0,8 ( 2;m ) is m = -31.