28=20+b

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Solution for 28=20+b equation: 



28=20+b

We move all terms to the left:

28-(20+b)=0

We add all the numbers together, and all the variables

-(b+20)+28=0

We get rid of parentheses

-b-20+28=0

We add all the numbers together, and all the variables

-1b+8=0

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

-b=-8

b=-8/-1

b=+8

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