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(-7)(-6) 42
--------- = -----
-7 + (-6) -13
(-4) - (-4) = 0
Y la segunda forma es esta:
(-7) + (-6) = -13
(-4) - (-4) = (-4) + 4 = 0
-13 × 0 = 0
Hazlo la que te parece mas fácil de entender