13=d/21

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Solution for 13=d/21 equation: 



13=d/21

We move all terms to the left:

13-(d/21)=0

We add all the numbers together, and all the variables

-(+d/21)+13=0

We get rid of parentheses

-d/21+13=0

We multiply all the terms by the denominator


-d+13*21=0

We add all the numbers together, and all the variables

-1d+273=0

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

-d=-273

d=-273/-1

d=+273

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