9=30+b

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Solution for 9=30+b equation: 



9=30+b

We move all terms to the left:

9-(30+b)=0

We add all the numbers together, and all the variables

-(b+30)+9=0

We get rid of parentheses

-b-30+9=0

We add all the numbers together, and all the variables

-1b-21=0

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

-b=21

b=21/-1

b=-21

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