21=5+b

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Solution for 21=5+b equation: 



21=5+b

We move all terms to the left:

21-(5+b)=0

We add all the numbers together, and all the variables

-(b+5)+21=0

We get rid of parentheses

-b-5+21=0

We add all the numbers together, and all the variables

-1b+16=0

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

-b=-16

b=-16/-1

b=+16

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