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-2.4k+3.6=-7.8
We move all terms to the left:
-2.4k+3.6-(-7.8)=0
We add all the numbers together, and all the variables
-2.4k+11.4=0
We move all terms containing k to the left, all other terms to the right
-2.4k=-11.4
k=-11.4/-2.4
k=4+1/1.3333333333333
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