(-2,56+(-3,34))+(-2 2/3+(-1 2/15))

Compute step by step (using decimal comma as in the problem):

• First part: (-2,56 + (-3,34)) = -2,56 - 3,34 = -5,90
• Second part: (-2 2/3 + (-1 2/15)) = (-8/3) + (-17/15) = -40/15 - 17/15 = -57/15 = -19/5 = -3,80

Add them: -5,90 + (-3,80) = -9,70

Final result: -9,70 (which is -97/10 in fractional form).