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13=k/2+4
We move all terms to the left:
13-(k/2+4)=0
We get rid of parentheses
-k/2-4+13=0
We multiply all the terms by the denominator
-k-4*2+13*2=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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