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30=3.14d
We move all terms to the left:
30-(3.14d)=0
We add all the numbers together, and all the variables
-(+3.14d)+30=0
We get rid of parentheses
-3.14d+30=0
We move all terms containing d to the left, all other terms to the right
-3.14d=-30
d=-30/-3.14
d=9+1/1.8045977011494
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