-1064
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7 can be subtracted from 1071 a total of 153 times. This is calculated by dividing 1071 by 7, which equals 153.2857. Since we cannot have a fraction of a subtraction, we take the whole number part of the quotient, which is 153.
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