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