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-10k-7=-9k
We move all terms to the left:
-10k-7-(-9k)=0
We get rid of parentheses
-10k+9k-7=0
We add all the numbers together, and all the variables
-1k-7=0
We move all terms containing k to the left, all other terms to the right
-k=7
k=7/-1
k=-7
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