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December 18, 2014

December 18, 2014

Posted by **John** on Tuesday, September 6, 2011 at 8:14pm.

- Math -
**bobpursley**, Tuesday, September 6, 2011 at 8:17pmYOu will have to use the zero addition principle also.

0+a=a

so

0+(x+13)=x+13=13+x

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