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--> 12x - 6y
b. 3(a + 2) + 2(3a - 1) =
--> 3a + 6 + 6a - 2
--> 3a + 6a + 6 - 2
--> 9a + 4
= 12x - 6y
b. 3 (a + 2) + 2 (3a - 1)
= 3a + 6 + 6a - 2
= 3a + 6a + 6 -2
= (3 + 6 ) a + (6-2)
= 9a + 4