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-4-(-22)=? 

 Dec 16, 2016
 #1
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-4 - (-22)

Means

-4 + 22

Rearranged: 22 - 4 = -4 + 22

22 - 4 = 18 = -4 + 22 = -4 - (-22)

 Dec 16, 2016

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