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2.1-0.2k-1.78k=6.06
We move all terms to the left:
2.1-0.2k-1.78k-(6.06)=0
We add all the numbers together, and all the variables
-1.98k-3.96=0
We move all terms containing k to the left, all other terms to the right
-1.98k=3.96
k=3.96/-1.98
k=-2
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