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12k+12=18k-12
We move all terms to the left:
12k+12-(18k-12)=0
We get rid of parentheses
12k-18k+12+12=0
We add all the numbers together, and all the variables
-6k+24=0
We move all terms containing k to the left, all other terms to the right
-6k=-24
k=-24/-6
k=+4
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