-b+20=-9(-b+20)

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Solution for -b+20=-9(-b+20) equation: 



-b+20=-9(-b+20)

We move all terms to the left:

-b+20-(-9(-b+20))=0

We add all the numbers together, and all the variables

-b-(-9(-1b+20))+20=0

We add all the numbers together, and all the variables

-1b-(-9(-1b+20))+20=0



We calculate terms in parentheses: -(-9(-1b+20)), so:

-9(-1b+20)

We multiply parentheses

9b-180

Back to the equation:

-(9b-180)



We get rid of parentheses

-1b-9b+180+20=0

We add all the numbers together, and all the variables

-10b+200=0

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

-10b=-200

b=-200/-10

b=+20

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