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20a2b2
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(5a - 4b) + (2c - 3b - 6c) + a =5a - 4b + 2c - 3b - 6c + a =(5a + a) + (-4b - 3b) + (2c - 6c) =[ 6a - 7b - 4c ].
2a + 4b
5a + 4b - 3a =(5a - 3a) + 4b =2a + 4b =2 (a + 2b)
-2a plus 3b
2a