-21=-7(b-2)-5(7-5b)

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Solution for -21=-7(b-2)-5(7-5b) equation: 



-21=-7(b-2)-5(7-5b)

We move all terms to the left:

-21-(-7(b-2)-5(7-5b))=0

We add all the numbers together, and all the variables

-(-7(b-2)-5(-5b+7))-21=0



We calculate terms in parentheses: -(-7(b-2)-5(-5b+7)), so:

-7(b-2)-5(-5b+7)

We multiply parentheses

-7b+25b+14-35

We add all the numbers together, and all the variables

18b-21

Back to the equation:

-(18b-21)



We get rid of parentheses

-18b+21-21=0

We add all the numbers together, and all the variables

-18b=0

b=0/-18

b=0

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