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6a - 12a = -6a
10b + 8b = 18b
6+24 = 30
-6a + 18b + 30
2. 9a+12 - (7a+14) = 9a-7a= 3a 12-14 = -2
3a - 2
3. 4p-11q-9r - (-8p+10q-9r)
4p + 8p = 12p
-11q -10q = -21q
-9r+9r = 0
12p - 21q
maaf banget kalo ada yang salah ya
= 6a - 12a + 10b + 8b + 6 + 24
= -6a + 18b + 30
2. 9a + 12 - 7a +14
= 9a - 7a + 12 + 14
= 2a + 26
3. 4p - 11q - 9r + 8p +10q - 9r
= 4p + 8p - 11q + 10q -9r - 9r
= 12p - q - 18r