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b 15a-11a+7b-12b-5c+13d = 3a-5b-5c+13d
2.a . -3m-8m+4n+7n-6+10 = -11m+11n+4
b.15a-11a+7b-12b-5+13d = 4a+18b-5c+13d
1. a. 11n - 11m + 4
b. 4a -5b - 5c + 13 d
2. a. -3n + 5m - 16
b. 26 a + 19b -5c - 13 d