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2. 15a + 7b - 5c dengan -11a - 12b + 13d = 15a - 11a + 7b -5c +13d=4 a + 7b -5c +13d
3.-3m + 4n - 6 dengan 7n - 8m + 10 = -3m -8m + 4n + 7n -6 + 10=-11 m + 11n + 4
4. 15a + 7b - 5c dengan -11a - 12b + 13d =15a - 11a + 7b - 12b - 5c +13 d=4 a +5-5 c +13d
5.(5x - 6y + 8z) + (7x - 9z) - (2y + 9z -10)=-5x + 6y - 8z - 7x + 9z - 2y -9z +10=-5x-7x + 6y - 2y - 8z +9z -9z=-12 x + 4 y - 2 y - 1z=12x + 2y
#semoga_bermanfaat_yah (Y)