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.55k-5.9=-2.1
We move all terms to the left:
.55k-5.9-(-2.1)=0
We add all the numbers together, and all the variables
.55k-3.8=0
We move all terms containing k to the left, all other terms to the right
.55k=3.8
k=3.8/.55
k=6+0.5/.55
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