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4.07=k0.07+3k
We move all terms to the left:
4.07-(k0.07+3k)=0
We add all the numbers together, and all the variables
-(+3k+k0.07)+4.07=0
We get rid of parentheses
-3k-k0.07+4.07=0
We move all terms containing k to the left, all other terms to the right
-3k-k0.07=-4.07
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