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Is -9 a solution of -2f=9-f I believe it is not, but need to check
Guest Mar 4, 2012
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 #1
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it is...
-2(-9)=18
9-(-9)=9+9=18
Guest Mar 4, 2012
 #2
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actually ur right.

-2f=9-f
then -2f+f=9

-f=9
f= -9
Guest Mar 4, 2012

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