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= -3m + 4n -6 +( 7n - 8m +10)
= -3m + 4n -6 + 7n - 8m +10
= -11m + 11n + 4
jawaban soal B
= 15a + 7b - 5c + (-11a -12b +13c )
= 15a + 7b - 5c -11a -12b +13c
= 3a - 5b + 7c