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13=k/6+9-7
We move all terms to the left:
13-(k/6+9-7)=0
We add all the numbers together, and all the variables
-(k/6+2)+13=0
We get rid of parentheses
-k/6-2+13=0
We multiply all the terms by the denominator
-k-2*6+13*6=0
We add all the numbers together, and all the variables
-1k+66=0
We move all terms containing k to the left, all other terms to the right
-k=-66
k=-66/-1
k=+66
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