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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-4.2=0
We move all terms containing k to the left, all other terms to the right
-2.4k=4.2
k=4.2/-2.4
k=-1+1/1.3333333333333
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