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