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-2.4k+3.5=-7.8
We move all terms to the left:
-2.4k+3.5-(-7.8)=0
We add all the numbers together, and all the variables
-2.4k+11.3=0
We move all terms containing k to the left, all other terms to the right
-2.4k=-11.3
k=-11.3/-2.4
k=4+1/1.4117647058824
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