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This question as written can be taken two ways:
9m + 6n - 3m + 7n = 6m + 13n, or (9m + 6n) - (3m + 7n) = 9m + 6n - 3m - 7n = 6m - n
9m - 14n
5m-13n-n+4m=
(5+4)m+(-13-1)n=
9m-14n
9m + 9m + 3m + 3m = 24m
Wayne Northrop's birth name is Northrop, Wayne Alan.