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66=d/6+57
We move all terms to the left:
66-(d/6+57)=0
We get rid of parentheses
-d/6-57+66=0
We multiply all the terms by the denominator
-d-57*6+66*6=0
We add all the numbers together, and all the variables
-1d+54=0
We move all terms containing d to the left, all other terms to the right
-d=-54
d=-54/-1
d=+54
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