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40.8=5.1k
We move all terms to the left:
40.8-(5.1k)=0
We add all the numbers together, and all the variables
-(+5.1k)+40.8=0
We get rid of parentheses
-5.1k+40.8=0
We move all terms containing k to the left, all other terms to the right
-5.1k=-40.8
k=-40.8/-5.1
k=+8
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