It is 9 times when it is subtracted from 42 and until reached 0
7N - 4N = 24
1, 3, 7, 9, 17, 21, 51, 63, 119, 153, 357, 1071.
21
7 hours subtracted by 30 minutes = -23
-2835
-156
7 can be subtracted from 49 only one time.
It is 9 times when it is subtracted from 42 and until reached 0
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0.58 subtracted by 7 = -6.42
7N - 4N = 24
1, 3, 7, 9, 17, 21, 51, 63, 119, 153, 357, 1071.
1.5 subtracted from 8.5 is one of infinitely many possible answers.
21
7 hours subtracted by 30 minutes = -23
13