First, let's solve the expressions within parentheses:

0,13 • 3 = 0,39

Now, let's substitute these values back into the original expression:

-(0,39 + 2,1) + (0,39 - 2,1) - 0,8
= -(2,49) + (-1,71) - 0,8
= -2,49 - 1,71 - 0,8
= -4,2 - 0,8
= -5

Therefore, -(0,39 + 2,1) + (0,13 • 3 - 2,1) - 0,8 equals -5.