21=17+b

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Solution for 21=17+b equation: 



21=17+b

We move all terms to the left:

21-(17+b)=0

We add all the numbers together, and all the variables

-(b+17)+21=0

We get rid of parentheses

-b-17+21=0

We add all the numbers together, and all the variables

-1b+4=0

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

-b=-4

b=-4/-1

b=+4

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