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-4k=-2k+12
We move all terms to the left:
-4k-(-2k+12)=0
We get rid of parentheses
-4k+2k-12=0
We add all the numbers together, and all the variables
-2k-12=0
We move all terms containing k to the left, all other terms to the right
-2k=12
k=12/-2
k=-6
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