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-7k-10=-9k
We move all terms to the left:
-7k-10-(-9k)=0
We get rid of parentheses
-7k+9k-10=0
We add all the numbers together, and all the variables
2k-10=0
We move all terms containing k to the left, all other terms to the right
2k=10
k=10/2
k=5
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