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OpenStudy (anonymous):
(-9a+4b-c)-(-2b+4c-7d) subtract
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OpenStudy (anonymous):
i am not sure but -9a+6b-5c-7d
OpenStudy (anonymous):
collect like terms first, I guess, Like you said.......my not problems have powers so I think its different, I was going to try FOIL method
OpenStudy (anonymous):
note*
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