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4.2k=17.7
We move all terms to the left:
4.2k-(17.7)=0
We add all the numbers together, and all the variables
4.2k-17.7=0
We move all terms containing k to the left, all other terms to the right
4.2k=17.7
k=17.7/4.2
k=4+0.9/4.2
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