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8.5=k-9.5
We move all terms to the left:
8.5-(k-9.5)=0
We get rid of parentheses
-k+9.5+8.5=0
We add all the numbers together, and all the variables
-1k+18=0
We move all terms containing k to the left, all other terms to the right
-k=-18
k=-18/-1
k=+18
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