28=31-d

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Solution for 28=31-d equation: 



28=31-d

We move all terms to the left:

28-(31-d)=0

We add all the numbers together, and all the variables

-(-1d+31)+28=0

We get rid of parentheses

1d-31+28=0

We add all the numbers together, and all the variables

d-3=0

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

d=3

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