-5b-3=21+b

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Solution for -5b-3=21+b equation: 



-5b-3=21+b

We move all terms to the left:

-5b-3-(21+b)=0

We add all the numbers together, and all the variables

-5b-(b+21)-3=0

We get rid of parentheses

-5b-b-21-3=0

We add all the numbers together, and all the variables

-6b-24=0

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

-6b=24

b=24/-6

b=-4

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