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5.5k=2.5k-15
We move all terms to the left:
5.5k-(2.5k-15)=0
We get rid of parentheses
5.5k-2.5k+15=0
We add all the numbers together, and all the variables
3k+15=0
We move all terms containing k to the left, all other terms to the right
3k=-15
k=-15/3
k=-5
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