-30=12-6b

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Solution for -30=12-6b equation: 



-30=12-6b

We move all terms to the left:

-30-(12-6b)=0

We add all the numbers together, and all the variables

-(-6b+12)-30=0

We get rid of parentheses

6b-12-30=0

We add all the numbers together, and all the variables

6b-42=0

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

6b=42

b=42/6

b=7

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