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13+x=20

Guest Aug 16, 2017
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 #1
avatar+333 
+1

13+x=20

13+x-13=20-13

x=7

Mathhemathh  Aug 16, 2017
 #2
avatar
+1

13+x=20

20-13=x

20-13=7

Therefore x=7

Guest Aug 16, 2017

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