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11=k/3+7
We move all terms to the left:
11-(k/3+7)=0
We get rid of parentheses
-k/3-7+11=0
We multiply all the terms by the denominator
-k-7*3+11*3=0
We add all the numbers together, and all the variables
-1k+12=0
We move all terms containing k to the left, all other terms to the right
-k=-12
k=-12/-1
k=+12
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