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( -3m + 4n - 6) - (7n - 8m + 10)
= -3 m + 4n - 6 - 7n + 8m - 10
= 5m - 3n - 16
b.) Pengurangan 15a + 7b - 5c dengan -11a - 12b + 13d
(15a + 7b - 5c) - (-11a - 12b + 13d)
= 15a + 7b - 5c + 11a + 12b - 13d
= 26a + 19b - 5c - 13d
c.) Hasil dari ( 5x - 6y + 8z) + (7x - 9z) -( 2y + 9z - 10)
= 5x - 6y + 8z + 7x - 9z - 2y - 9z + 10
= 12x - 8y - 10z + 10