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45=k/3+39
We move all terms to the left:
45-(k/3+39)=0
We get rid of parentheses
-k/3-39+45=0
We multiply all the terms by the denominator
-k-39*3+45*3=0
We add all the numbers together, and all the variables
-1k+18=0
We move all terms containing k to the left, all other terms to the right
-k=-18
k=-18/-1
k=+18
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