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3.5k+k+k=11.55
We move all terms to the left:
3.5k+k+k-(11.55)=0
We add all the numbers together, and all the variables
5.5k-11.55=0
We move all terms containing k to the left, all other terms to the right
5.5k=11.55
k=11.55/5.5
k=2+0.55/5.5
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