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5k+8k+18=12k+11
We move all terms to the left:
5k+8k+18-(12k+11)=0
We add all the numbers together, and all the variables
13k-(12k+11)+18=0
We get rid of parentheses
13k-12k-11+18=0
We add all the numbers together, and all the variables
k+7=0
We move all terms containing k to the left, all other terms to the right
k=-7
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