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= -3m + 4n - 6 + 7n -8m + 10
= -3m - 8m + 4n+ 7n - 6 + 10
= -11m + 11n + 4
B. (15a + 7b - 5c) + (-11a - 12b +13d)
= 15a + 7b - 5c -11a - 12b + 13d
= 15a - 11a + 7b -12b - 5c + 13d
= 4a - 5b -5c + 13d
C. (15a + 7b - 5c) - (-11a - 12b +13d)
= 15a + 7b -5c + 11a + 12b - 13d
= 15a + 11a + 7b + 12b - 5c - 13d
= 26a + 19b - 5c - 13d