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6.1+2k=8.5
We move all terms to the left:
6.1+2k-(8.5)=0
We add all the numbers together, and all the variables
2k-2.4=0
We move all terms containing k to the left, all other terms to the right
2k=2.4
k=2.4/2
k=1+0.4/2
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