13=d-7

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Solution for 13=d-7 equation: 



13=d-7

We move all terms to the left:

13-(d-7)=0

We get rid of parentheses

-d+7+13=0

We add all the numbers together, and all the variables

-1d+20=0

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

-d=-20

d=-20/-1

d=+20

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