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-18=k+5k
We move all terms to the left:
-18-(k+5k)=0
We add all the numbers together, and all the variables
-(+6k)-18=0
We get rid of parentheses
-6k-18=0
We move all terms containing k to the left, all other terms to the right
-6k=18
k=18/-6
k=-3
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