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-4k+18=-2k
We move all terms to the left:
-4k+18-(-2k)=0
We get rid of parentheses
-4k+2k+18=0
We add all the numbers together, and all the variables
-2k+18=0
We move all terms containing k to the left, all other terms to the right
-2k=-18
k=-18/-2
k=+9
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