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93=0.5d+66
We move all terms to the left:
93-(0.5d+66)=0
We get rid of parentheses
-0.5d-66+93=0
We add all the numbers together, and all the variables
-0.5d+27=0
We move all terms containing d to the left, all other terms to the right
-0.5d=-27
d=-27/-0.5
d=+54
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