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3.5k=21.35
We move all terms to the left:
3.5k-(21.35)=0
We add all the numbers together, and all the variables
3.5k-21.35=0
We move all terms containing k to the left, all other terms to the right
3.5k=21.35
k=21.35/3.5
k=6+0.35/3.5
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