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1-10k=9-9k
We move all terms to the left:
1-10k-(9-9k)=0
We add all the numbers together, and all the variables
-10k-(-9k+9)+1=0
We get rid of parentheses
-10k+9k-9+1=0
We add all the numbers together, and all the variables
-1k-8=0
We move all terms containing k to the left, all other terms to the right
-k=8
k=8/-1
k=-8
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