: (- 0.5) + (+ 1 / 3) + (+ 6.75) + (- 1 / 5)
(- 0.5) + (+ 1 / 3) + (+ 6.75) + (- 1 / 2)
=- (0.5 + 5 and 1 / 2) + (3 and 1 / 4 + 6.75)
= -6+10
=4
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