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3,5 + (-7)= -3,5
-1/2 + 1/2= 0
1/2 + ( -11/2) = - 1
-1/2 + 1 = 1/2
3,5 + (-7) = - 3,5
- 1/2 + 1/2= 0
1/2 + (- 1 1/2) = -1
-1/2 + 1 = 1/2