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-30-2k=-7k
We move all terms to the left:
-30-2k-(-7k)=0
We get rid of parentheses
-2k+7k-30=0
We add all the numbers together, and all the variables
5k-30=0
We move all terms containing k to the left, all other terms to the right
5k=30
k=30/5
k=6
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