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7=k/3+3
We move all terms to the left:
7-(k/3+3)=0
We get rid of parentheses
-k/3-3+7=0
We multiply all the terms by the denominator
-k-3*3+7*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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