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= 6a+2b - 12a+3b + 6a-2b
= 6a - 12a + 6a + 2b +3b - 2b
= 3b
2. 5(a-b) -4(3a-2b) -5(4a-b)
= 5a-5b -12a + 8b -20a + 5b
= 5a - 12a -20a -5b + 8b + 5b
= -27a + 2b
= 6a+2b - 12a+3b + 6a-2b
= 6a - 12a + 6a + 2b +3b - 2b
= 3b
2. 5(a-b) -4(3a-2b) -5(4a-b)
= 5a-5b -12a + 8b -20a + 5b
= 5a - 12a -20a -5b + 8b + 5b
= -27a + 2b