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2(k+3)=k
We move all terms to the left:
2(k+3)-(k)=0
We add all the numbers together, and all the variables
-1k+2(k+3)=0
We multiply parentheses
-1k+2k+6=0
We add all the numbers together, and all the variables
k+6=0
We move all terms containing k to the left, all other terms to the right
k=-6
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