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30 minus 11 is 19.
11/30
19/20 minus 11/12 = 1/30
3/10 - 11/15= 9/30 - 22/30 = -13/30
2 minus 5/6 = 11/6
11
11/307/10 minus 1/3 is 11/30.
11/30 - 1/5 - 1/6 = 0
-0.02
-30 - (-24) = -30 + 24 = -6
11/15 minus 3/10 = 13/30
11/15 − 3/10 = 13/30