2b+b-4
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It is 2a-b simplified
4a+2b-1a+9b combine all alike variables using commutative property of addition 4a-1a+2b+9b Then add the like variables 3a+11b
Add them together: 3a+4a-a = 6a
Well if you are adding you would have 8a+2b subtract you would have -2a+2b
7a-2b