-3=b+9

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Solution for -3=b+9 equation: 



-3=b+9

We move all terms to the left:

-3-(b+9)=0

We get rid of parentheses

-b-9-3=0

We add all the numbers together, and all the variables

-1b-12=0

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

-b=12

b=12/-1

b=-12

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