30=-5(9+b)+20

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Solution for 30=-5(9+b)+20 equation: 



30=-5(9+b)+20

We move all terms to the left:

30-(-5(9+b)+20)=0

We add all the numbers together, and all the variables

-(-5(b+9)+20)+30=0



We calculate terms in parentheses: -(-5(b+9)+20), so:

-5(b+9)+20

We multiply parentheses

-5b-45+20

We add all the numbers together, and all the variables

-5b-25

Back to the equation:

-(-5b-25)



We get rid of parentheses

5b+25+30=0

We add all the numbers together, and all the variables

5b+55=0

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

5b=-55

b=-55/5

b=-11

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