excel2007 cell to the negative of the negative sign in front of how to remove?

Users questions: A column value should increase the number of column C column B, C out at the same time minus a few values ​​to get a positive and negative, how negative this column among the columns to remove the whole have become positive. Please give a detailed steps (be sure to detail, you do not know how much food).
Experts answer: with the absolute value function = abs ()
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