28=20+d

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Solution for 28=20+d equation: 



28=20+d

We move all terms to the left:

28-(20+d)=0

We add all the numbers together, and all the variables

-(d+20)+28=0

We get rid of parentheses

-d-20+28=0

We add all the numbers together, and all the variables

-1d+8=0

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

-d=-8

d=-8/-1

d=+8

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