21+27=b+28=20

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Solution for 21+27=b+28=20 equation: 



21+27=b+28=20

We move all terms to the left:

21+27-(b+28)=0

We add all the numbers together, and all the variables

-(b+28)+48=0

We get rid of parentheses

-b-28+48=0

We add all the numbers together, and all the variables

-1b+20=0

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

-b=-20

b=-20/-1

b=+20

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