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13.8=k+2.1
We move all terms to the left:
13.8-(k+2.1)=0
We get rid of parentheses
-k-2.1+13.8=0
We add all the numbers together, and all the variables
-1k+11.7=0
We move all terms containing k to the left, all other terms to the right
-k=-11.7
k=-11.7/-1
k=11+0.7/1
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