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8=3.14(d)/3.14
We move all terms to the left:
8-(3.14(d)/3.14)=0
We add all the numbers together, and all the variables
-(+3.14d/3.14)+8=0
We get rid of parentheses
-3.14d/3.14+8=0
We multiply all the terms by the denominator
-3.14d+8*3.14=0
We add all the numbers together, and all the variables
-3.14d+25.12=0
We move all terms containing d to the left, all other terms to the right
-3.14d=-25.12
d=-25.12/-3.14
d=+8
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