21-6b=-3(5b-1)

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Solution for 21-6b=-3(5b-1) equation: 



21-6b=-3(5b-1)

We move all terms to the left:

21-6b-(-3(5b-1))=0



We calculate terms in parentheses: -(-3(5b-1)), so:

-3(5b-1)

We multiply parentheses

-15b+3

Back to the equation:

-(-15b+3)



We get rid of parentheses

-6b+15b-3+21=0

We add all the numbers together, and all the variables

9b+18=0

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

9b=-18

b=-18/9

b=-2

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