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-4k+3.6=7.8=
We move all terms to the left:
-4k+3.6-(7.8)=0
We add all the numbers together, and all the variables
-4k-4.2=0
We move all terms containing k to the left, all other terms to the right
-4k=4.2
k=4.2/-4
k=-1+0.2/4
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