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b. 4a-5b-5c+13d
= -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
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