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1.57=3.14(d)
We move all terms to the left:
1.57-(3.14(d))=0
We add all the numbers together, and all the variables
-(+3.14d)+1.57=0
We get rid of parentheses
-3.14d+1.57=0
We move all terms containing d to the left, all other terms to the right
-3.14d=-1.57
d=-1.57/-3.14
d=1/2
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