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The answer is 53.
-53+n = -28 n = -28+53 n = 25
17 + 11 = 28 + 25 = 53 - 12 = 41.
69 - without the aid of a calculator !
53
25 x 53 = 1325
(20 x 4) + 25 - 52 = 53
12 + 32 + 53 = 97
6/25 + 7/15 = 53/75
-53
347 + 1583 + 53 = 1983
53 + 137 = 190