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-18+18k=12+20k
We move all terms to the left:
-18+18k-(12+20k)=0
We add all the numbers together, and all the variables
18k-(20k+12)-18=0
We get rid of parentheses
18k-20k-12-18=0
We add all the numbers together, and all the variables
-2k-30=0
We move all terms containing k to the left, all other terms to the right
-2k=30
k=30/-2
k=-15
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