6b+9=-3b-9

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Solution for 6b+9=-3b-9 equation: 



6b+9=-3b-9

We move all terms to the left:

6b+9-(-3b-9)=0

We get rid of parentheses

6b+3b+9+9=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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