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avatar+105 

3- -9

 Sep 16, 2018
 #1
avatar+2446 
+1

3(9)=3+9=12

.
 Sep 16, 2018
 #2
avatar+4624 
+1

Negative changes to positive, so 3(9)=3+9=12 .

 Sep 16, 2018

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