SOLUTION: i've tried to figure this out for fifteen minutes and can't. Will you please help me? [(31a-36b)-21c]-[19a-(39c+43b)]

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Question 50261: i've tried to figure this out for fifteen minutes and can't. Will you please help me?
[(31a-36b)-21c]-[19a-(39c+43b)]
Found 2 solutions by hulamc723, stanbon:
Answer by hulamc723(15) About Me  (Show Source):
You can put this solution on YOUR website!
[(31a-36b)-21c]-[19a-(39c+43b)]
Don't even worry about the parenthesis inside, just add like terms!
31a-36b-21c-19a+39c-43b
12a-79b+18c
*Be sure to distribute the negative in the second part!
-mc

Answer by stanbon(57347) About Me  (Show Source):
You can put this solution on YOUR website!
[(31a-36b)-21c]-[19a-(39c+43b)]
=31a-36b-21c-[19a-39c-43b]
=31a-36b-21c-19a+39c+43b
=12a+7b+18c
Cheers,
Stan H.