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39=3.14(d)
We move all terms to the left:
39-(3.14(d))=0
We add all the numbers together, and all the variables
-(+3.14d)+39=0
We get rid of parentheses
-3.14d+39=0
We move all terms containing d to the left, all other terms to the right
-3.14d=-39
d=-39/-3.14
d=12+1/2.37878787879
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