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-7=5k+2k
We move all terms to the left:
-7-(5k+2k)=0
We add all the numbers together, and all the variables
-(+7k)-7=0
We get rid of parentheses
-7k-7=0
We move all terms containing k to the left, all other terms to the right
-7k=7
k=7/-7
k=-1
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