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