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18+5k=3k-20
We move all terms to the left:
18+5k-(3k-20)=0
We get rid of parentheses
5k-3k+20+18=0
We add all the numbers together, and all the variables
2k+38=0
We move all terms containing k to the left, all other terms to the right
2k=-38
k=-38/2
k=-19
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