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-3m - 8m + 4n - 7n - 6+ 10 =
-11m - 3n + 4
B. (15a + 7b - 5c) - (11a - 12b +13d)
15a - 11a + 7b - 12b - 5c + 13d =
4a - 5b - 5c + 13d
B. -4a-19b+5c+13d