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 get rid of parentheses

-d+21+13=0

We add all the numbers together, and all the variables

-1d+34=0

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

-d=-34

d=-34/-1

d=+34

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