b+3=3b-9

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Solution for b+3=3b-9 equation: 



b+3=3b-9

We move all terms to the left:

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

We get rid of parentheses

b-3b+9+3=0

We add all the numbers together, and all the variables

-2b+12=0

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

-2b=-12

b=-12/-2

b=+6

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