-30=3b+15

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Solution for -30=3b+15 equation: 



-30=3b+15

We move all terms to the left:

-30-(3b+15)=0

We get rid of parentheses

-3b-15-30=0

We add all the numbers together, and all the variables

-3b-45=0

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

-3b=45

b=45/-3

b=-15

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