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-51=9-10k
We move all terms to the left:
-51-(9-10k)=0
We add all the numbers together, and all the variables
-(-10k+9)-51=0
We get rid of parentheses
10k-9-51=0
We add all the numbers together, and all the variables
10k-60=0
We move all terms containing k to the left, all other terms to the right
10k=60
k=60/10
k=6
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