+0  
 
0
339
2
avatar

13+x=20

 Aug 16, 2017
 #1
avatar+349 
+1

13+x=20

13+x-13=20-13

x=7

 Aug 16, 2017
 #2
avatar
+1

13+x=20

20-13=x

20-13=7

Therefore x=7

 Aug 16, 2017

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