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January 25, 2015

January 25, 2015

Posted by **Joanna** on Thursday, September 8, 2011 at 2:15pm.

- algbra -
**bobpursley**, Thursday, September 8, 2011 at 3:13pmconsider postive chips to be red, negative to be black. Each black stacked on a red is zero.

put out the positive, then take the black chips, stacking them on the red. So you have two left over. Sum is -2, as all the zeroes don't matter.

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