-21+7b=-2(6-8b)

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Solution for -21+7b=-2(6-8b) equation: 



-21+7b=-2(6-8b)

We move all terms to the left:

-21+7b-(-2(6-8b))=0

We add all the numbers together, and all the variables

7b-(-2(-8b+6))-21=0



We calculate terms in parentheses: -(-2(-8b+6)), so:

-2(-8b+6)

We multiply parentheses

16b-12

Back to the equation:

-(16b-12)



We get rid of parentheses

7b-16b+12-21=0

We add all the numbers together, and all the variables

-9b-9=0

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

-9b=9

b=9/-9

b=-1

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