(- 0.5) - (3 and 1 / 4) + 6.75-5 and 1 / 2,
3 and 1 / 4 = 3.25
5 and 1 / 2 = 5.5
Original formula = (- 0.5) - 3.25 + 6.75-5.5 = - 2.5
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