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soal A
= (-3m + 4n -6) + ( 7n - 8m + 10)
= -3m +4n -6 + 7n - 8m + 10
= -11m + 11n + 4
soal B
= (15a + 7b - 5c) + ( -11a-12b + 13d)
= 15a + 7b - 5c -11a-12b + 13d
= 4a -5b -5c +13d
pengurangn bentuk AL-jabar
soal A
= (-3m + 4n - 6) - ( 7n - 8m + 10)
= -3m +4n -6 -7n + 8m -10
= 5m -3n -16
soal B
= (15a + 7b -5c) - ( -11a -12b + 13d )
= 15a +7b -5c +11a +12b -13d
= 26a + 19b -5c -14d