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19/15 : -7/30=
19/15 x -30/7=
-38/7=-5 3/7
(10/15 + 9/15) : (18/30 - 25/30)
19/15 : - 7/30
19/15 x -30/7
19/1 x -2/7
-18/7
-2 4/7