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-85=5k-5
We move all terms to the left:
-85-(5k-5)=0
We get rid of parentheses
-5k+5-85=0
We add all the numbers together, and all the variables
-5k-80=0
We move all terms containing k to the left, all other terms to the right
-5k=80
k=80/-5
k=-16
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