-30=-9b-12

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Solution for -30=-9b-12 equation: 



-30=-9b-12

We move all terms to the left:

-30-(-9b-12)=0

We get rid of parentheses

9b+12-30=0

We add all the numbers together, and all the variables

9b-18=0

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

9b=18

b=18/9

b=2

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