3a + 4b - (-6a) - 3b? There is no equivalent because you did not make it an equality.
However you could combine the numbers...
3a + 4b +6a -3b =
9a + 1b
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1a+3b 2a+4b=3a +7b
(5a - 4b) + (2c - 3b - 6c) + a =5a - 4b + 2c - 3b - 6c + a =(5a + a) + (-4b - 3b) + (2c - 6c) =[ 6a - 7b - 4c ].
6b+5a-4b+3a= ? Rearrange it as 5a+3a+6b-4b = 8a+2b
5a + 4b - 3a =(5a - 3a) + 4b =2a + 4b =2 (a + 2b)
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