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OpenStudy (anonymous):
combine like terms -9n-7+4n
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OpenStudy (doc.brown):
-n-n-n-n-n-n-n-n-n-7+n+n+n+n
OpenStudy (leoray):
add -9n and +4n. You will get -5n. With the only -7, you leave it . The answer is -5n-7.
OpenStudy (anonymous):
tx
OpenStudy (leoray):
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