Answers

2014-10-13T17:18:50+08:00
First we need to transfer the negative signs.
-b+a-8b-12-6a+3b

now arrange so we can add it together. make sure you bring the sign with it.
-b-8b+3b      +a-6a     -12
-6b   -5a   -12  this is the answer.


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