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-10k-9=9k+10
We move all terms to the left:
-10k-9-(9k+10)=0
We get rid of parentheses
-10k-9k-10-9=0
We add all the numbers together, and all the variables
-19k-19=0
We move all terms containing k to the left, all other terms to the right
-19k=19
k=19/-19
k=-1
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