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-0.8k-3.1=-8.3
We move all terms to the left:
-0.8k-3.1-(-8.3)=0
We add all the numbers together, and all the variables
-0.8k+5.2=0
We move all terms containing k to the left, all other terms to the right
-0.8k=-5.2
k=-5.2/-0.8
k=6+0.4/0.8
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