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9a-3a-\left(-3b\right)
To find the opposite of 3a-3b, find the opposite of each term.
9a-3a+3b
The opposite of -3b is 3b.
6a+3b
Combine 9a and -3a to get 6a.
9a-3a-\left(-3b\right)
To find the opposite of 3a-3b, find the opposite of each term.
9a-3a+3b
The opposite of -3b is 3b.
6a+3b
Combine 9a and -3a to get 6a.