10b=-7(-b+9)

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Solution for 10b=-7(-b+9) equation: 



10b=-7(-b+9)

We move all terms to the left:

10b-(-7(-b+9))=0

We add all the numbers together, and all the variables

10b-(-7(-1b+9))=0



We calculate terms in parentheses: -(-7(-1b+9)), so:

-7(-1b+9)

We multiply parentheses

7b-63

Back to the equation:

-(7b-63)



We get rid of parentheses

10b-7b+63=0

We add all the numbers together, and all the variables

3b+63=0

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

3b=-63

b=-63/3

b=-21

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