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