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-4k+3.6k=7.8
We move all terms to the left:
-4k+3.6k-(7.8)=0
We add all the numbers together, and all the variables
-0.4k-7.8=0
We move all terms containing k to the left, all other terms to the right
-0.4k=7.8
k=7.8/-0.4
k=-19+0.2/0.4
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