b+21=2b+20

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Solution for b+21=2b+20 equation: 



b+21=2b+20

We move all terms to the left:

b+21-(2b+20)=0

We get rid of parentheses

b-2b-20+21=0

We add all the numbers together, and all the variables

-1b+1=0

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

-b=-1

b=-1/-1

b=1

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