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k+4.2=5.9k+4.2=5.9
We move all terms to the left:
k+4.2-(5.9k+4.2)=0
We get rid of parentheses
k-5.9k-4.2+4.2=0
We add all the numbers together, and all the variables
-4.9k=0
k=0/-4.9
k=0
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