-9 13/40 - 6 11/35= -((9+6)+(13/40 + 11/35)) =
= -(15 + 179/280)= -15 179/280
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-9 13/40 - 6 11/35= -((9+6)+(13/40 + 11/35)) =
= -(15 + 179/280)= -15 179/280