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66=k/8+57
We move all terms to the left:
66-(k/8+57)=0
We get rid of parentheses
-k/8-57+66=0
We multiply all the terms by the denominator
-k-57*8+66*8=0
We add all the numbers together, and all the variables
-1k+72=0
We move all terms containing k to the left, all other terms to the right
-k=-72
k=-72/-1
k=+72
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