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= -3m+8m+4n-7n-6+10
= 5m-3n+4
b. (15a+7b-5c)-(-11a-12b+13d) = 15a+7b-5c+11a+12b-13d
= 15a+11a+7b+12b-5c-13d
= 26a+19b-5c-13d
3. (5x - 6y + 8z) + (7x - 9z) - (2y + 9z - 10) = 5x - 6y + 8z + 7x - 9z - 2y + 9z - 10
= 5x + 7x - 6y - 2y + 8z - 9z + 9z - 10
= 12x - 8y + 8z - 10