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