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480.65=66.95d+12
We move all terms to the left:
480.65-(66.95d+12)=0
We get rid of parentheses
-66.95d-12+480.65=0
We add all the numbers together, and all the variables
-66.95d+468.65=0
We move all terms containing d to the left, all other terms to the right
-66.95d=-468.65
d=-468.65/-66.95
d=6+1/1
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