12-(-3b)=9

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Solution for 12-(-3b)=9 equation: 



12-(-3b)=9

We move all terms to the left:

12-(-3b)-(9)=0

We add all the numbers together, and all the variables

-(-3b)+3=0

We get rid of parentheses

3b+3=0

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

3b=-3

b=-3/3

b=-1

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