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-9a+3b-3\left(b-3a\right)
Use the distributive property to multiply -3 by 3a-b.
-9a+3b-3b+9a
Use the distributive property to multiply -3 by b-3a.
-9a+9a
Combine 3b and -3b to get 0.
0
Combine -9a and 9a to get 0.
3\left(-\left(3a-b\right)-\left(b-3a\right)\right)
Factor out 3.
0
Simplify.
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