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39=10k-1
We move all terms to the left:
39-(10k-1)=0
We get rid of parentheses
-10k+1+39=0
We add all the numbers together, and all the variables
-10k+40=0
We move all terms containing k to the left, all other terms to the right
-10k=-40
k=-40/-10
k=+4
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