-1/2 - 1/2 = -2/2
-2/2 = -7/7
-7/7 + 5/7 = -2/7
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-2/7
-8/16 simplificado es -1/2
Así que sería:
-1/2 - 1/2 = -2/2
-2/2 = -7/7
Así que:
-7/7 + 5/7 = -2/7