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0.10k+0.25k+0.10k+3k=35
We move all terms to the left:
0.10k+0.25k+0.10k+3k-(35)=0
We add all the numbers together, and all the variables
3.45k-35=0
We move all terms containing k to the left, all other terms to the right
3.45k=35
k=35/3.45
k=10+0.5/3.45
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