9-b=-9-3b

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



9-b=-9-3b

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1b-(-3b-9)+9=0

We get rid of parentheses

-1b+3b+9+9=0

We add all the numbers together, and all the variables

2b+18=0

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

2b=-18

b=-18/2

b=-9

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