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-4.2k=-12.6
We move all terms to the left:
-4.2k-(-12.6)=0
We add all the numbers together, and all the variables
-4.2k+12.6=0
We move all terms containing k to the left, all other terms to the right
-4.2k=-12.6
k=-12.6/-4.2
k=3+-1.7763568394003E-15/4.2
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