b-(-9)=20

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



b-(-9)=20

We move all terms to the left:

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

determiningTheFunctionDomain
b-20-(-9)=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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