SOLUTION: 12b-[9-7(5b-6)]

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Question 28410: 12b-[9-7(5b-6)]
Answer by sdmmadam@yahoo.com(530) About Me  (Show Source):
You can put this solution on YOUR website!
12b-[9-7(5b-6)]
=12b-[9-35b+42]
=12b-[(9+42)-35b] using additive commutativity and then associativity
=12b-[51-35b]
=12b-51+35b
=(12b+35b)-51 using additive commutativity and then associativity
=47b-51