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69.1=3.14d
We move all terms to the left:
69.1-(3.14d)=0
We add all the numbers together, and all the variables
-(+3.14d)+69.1=0
We get rid of parentheses
-3.14d+69.1=0
We move all terms containing d to the left, all other terms to the right
-3.14d=-69.1
d=-69.1/-3.14
d=22+0.019999999999996/3.14
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