b-9+b=30

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Solution for b-9+b=30 equation: 



b-9+b=30

We move all terms to the left:

b-9+b-(30)=0

We add all the numbers together, and all the variables

2b-39=0

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

2b=39

b=39/2

b=19+1/2

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