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k+4=2k+6
We move all terms to the left:
k+4-(2k+6)=0
We get rid of parentheses
k-2k-6+4=0
We add all the numbers together, and all the variables
-1k-2=0
We move all terms containing k to the left, all other terms to the right
-k=2
k=2/-1
k=-2
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