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=(78/15-40/15) - 11/4
= 38/15 - 11/4
=152/60 - 165/60
= - 13/60
2. (1/4 : 1/6) : 1/9
= (1/4 x 6/1) : 1/9
=6/4 : 1/9
=6/4 x 9
=54/4