30=3b-9

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Solution for 30=3b-9 equation: 



30=3b-9

We move all terms to the left:

30-(3b-9)=0

We get rid of parentheses

-3b+9+30=0

We add all the numbers together, and all the variables

-3b+39=0

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

-3b=-39

b=-39/-3

b=+13

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