+0  
 
0
433
2
avatar+105 

3- -9

 Sep 16, 2018
 #1
avatar+2419 
+1

\(3-(-9)=3+9=12\)

.
 Sep 16, 2018
 #2
avatar+4569 
+1

Negative changes to positive, so \(3-(-9)=3+9=\boxed{12}\) .

 Sep 16, 2018

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