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13+2k=13-2k
We move all terms to the left:
13+2k-(13-2k)=0
We add all the numbers together, and all the variables
2k-(-2k+13)+13=0
We get rid of parentheses
2k+2k-13+13=0
We add all the numbers together, and all the variables
4k=0
k=0/4
k=0
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