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54-2k=4k+18
We move all terms to the left:
54-2k-(4k+18)=0
We get rid of parentheses
-2k-4k-18+54=0
We add all the numbers together, and all the variables
-6k+36=0
We move all terms containing k to the left, all other terms to the right
-6k=-36
k=-36/-6
k=+6
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