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= -3m+4n-7n+8m-10
= 5m-3n-10
b. 15a+7b-5c - (-11a-12b+13d)
= 15a+7b-5c+11a+12b-13d
= 26a+19b-5c-13d
= -3m + 8m + 4n - 7n - 6 -10
= 5m - 3n - 16
b) 15a+7b-5c - (-11a-12b+13d) = 15a + 7b - 5c + 11a + 12b - 13d
= 15a+11a+7b+12b-5c-13d
= 26a + 19b - 5c - 13d