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3a+b-2-\left(a-1\right)
Combine -b and b to get 0.
3a+b-2-a-\left(-1\right)
To find the opposite of a-1, find the opposite of each term.
3a+b-2-a+1
The opposite of -1 is 1.
3a+b-1-a
Add -2 and 1 to get -1.
2a+b-1
Combine 3a and -a to get 2a.
3a+b-2-\left(a-1\right)
Combine -b and b to get 0.
3a+b-2-a-\left(-1\right)
To find the opposite of a-1, find the opposite of each term.
3a+b-2-a+1
The opposite of -1 is 1.
3a+b-1-a
Add -2 and 1 to get -1.
2a+b-1
Combine 3a and -a to get 2a.