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-10k=-7k+9
We move all terms to the left:
-10k-(-7k+9)=0
We get rid of parentheses
-10k+7k-9=0
We add all the numbers together, and all the variables
-3k-9=0
We move all terms containing k to the left, all other terms to the right
-3k=9
k=9/-3
k=-3
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