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2k+1-k+1=13-2k+1
We move all terms to the left:
2k+1-k+1-(13-2k+1)=0
We add all the numbers together, and all the variables
2k-k-(-2k+14)+1+1=0
We add all the numbers together, and all the variables
k-(-2k+14)+2=0
We get rid of parentheses
k+2k-14+2=0
We add all the numbers together, and all the variables
3k-12=0
We move all terms containing k to the left, all other terms to the right
3k=12
k=12/3
k=4
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