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1: -6/8 -7/8 + 1/6 = -13/8 + 1/6 = -52/24 + 4/24 = -48/24 ó -2(simplificado)
2: -9.6 -2.6 +7.5 + 0.875 = -12.2 + 8.375 = -3.825
3: -0.75 + 9.28 = 8.53