7=13-3d

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Solution for 7=13-3d equation: 



7=13-3d

We move all terms to the left:

7-(13-3d)=0

We add all the numbers together, and all the variables

-(-3d+13)+7=0

We get rid of parentheses

3d-13+7=0

We add all the numbers together, and all the variables

3d-6=0

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

3d=6

d=6/3

d=2

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