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4+k/2=13
We move all terms to the left:
4+k/2-(13)=0
We add all the numbers together, and all the variables
k/2-9=0
We multiply all the terms by the denominator
k-9*2=0
We add all the numbers together, and all the variables
k-18=0
We move all terms containing k to the left, all other terms to the right
k=18
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