21=(3.14)d

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Solution for 21=(3.14)d equation: 



21=(3.14)d

We move all terms to the left:

21-((3.14)d)=0



We calculate terms in parentheses: -((3.14)d), so:

(3.14)d

We multiply parentheses

3.14d

Back to the equation:

-(3.14d)



We add all the numbers together, and all the variables

-(+3.14d)+21=0

We get rid of parentheses

-3.14d+21=0

We move all terms containing d to the left, all other terms to the right

-3.14d=-21

d=-21/-3.14

d=6+2.16/3.14

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