-21-3b=-6b-(b+5)

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Solution for -21-3b=-6b-(b+5) equation: 



-21-3b=-6b-(b+5)

We move all terms to the left:

-21-3b-(-6b-(b+5))=0



We calculate terms in parentheses: -(-6b-(b+5)), so:

-6b-(b+5)

We get rid of parentheses

-6b-b-5

We add all the numbers together, and all the variables

-7b-5

Back to the equation:

-(-7b-5)



We get rid of parentheses

-3b+7b+5-21=0

We add all the numbers together, and all the variables

4b-16=0

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

4b=16

b=16/4

b=4

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