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-16 - 63 = -79
63 minus 21 is 42.
45 - 63 = -18
63 - 18 = 45
111 - 63 = 48
56
It is: 63-4 = 59
91 - 63 = 28
63 - 10 = 53
100 - 63 = 37
63 - 37 = 26
6t2-13t-63 = (3t+7)(2t-9) when factored.
102