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