9-(-b)=20

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



9-(-b)=20

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-(-1b)-11=0

We get rid of parentheses

1b-11=0

We add all the numbers together, and all the variables

b-11=0

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

b=11

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