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27=15k-6k
We move all terms to the left:
27-(15k-6k)=0
We add all the numbers together, and all the variables
-(+9k)+27=0
We get rid of parentheses
-9k+27=0
We move all terms containing k to the left, all other terms to the right
-9k=-27
k=-27/-9
k=+3
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