It is 2a-b simplified
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Add them together: 3a+4a-a = 6a
You need to combine the different parts that contain the variable "a". Just add the coefficients together algebraically.
2b+b-4
It is an expression of two terms as: 4a+12
"a" plus "3a" is equal to 4a. (3a+a=4a). You already have 3 "a's" and then you add another "a."