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-4k+3.6=78
We move all terms to the left:
-4k+3.6-(78)=0
We add all the numbers together, and all the variables
-4k-74.4=0
We move all terms containing k to the left, all other terms to the right
-4k=74.4
k=74.4/-4
k=-18+1/1.6666666666667
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