(-1/5) + (- 3 4/5) + (- 8 3/20) =
= - (1/5 + 3 4/5 + 8 3/20) =
= - (4/20 + 3 16/20 + 8 3/20) =
= - (11 23/20) = - 12 3/20
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(-1/5) + (- 3 4/5) + (- 8 3/20) =
= - (1/5 + 3 4/5 + 8 3/20) =
= - (4/20 + 3 16/20 + 8 3/20) =
= - (11 23/20) = - 12 3/20