Respuesta:
-7 + 10 = +3
4 - 9 = -5
-11 + 8 = -3
-3 - 5 = -8
12 - 21 = -11
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Respuesta:
-7 + 10 = +3
4 - 9 = -5
-11 + 8 = -3
-3 - 5 = -8
12 - 21 = -11