28=3d+4d

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Solution for 28=3d+4d equation: 



28=3d+4d

We move all terms to the left:

28-(3d+4d)=0

We add all the numbers together, and all the variables

-(+7d)+28=0

We get rid of parentheses

-7d+28=0

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

-7d=-28

d=-28/-7

d=+4

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