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17.1+2.1k=3.9k

We move all terms to the left:

17.1+2.1k-(3.9k)=0

We add all the numbers together, and all the variables

2.1k-(+3.9k)+17.1=0

We get rid of parentheses

2.1k-3.9k+17.1=0

We add all the numbers together, and all the variables

-1.8k+17.1=0

We move all terms containing k to the left, all other terms to the right

-1.8k=-17.1

k=-17.1/-1.8

k=9+0.9/1.8

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