9=b-9

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Solution for 9=b-9 equation: 



9=b-9

We move all terms to the left:

9-(b-9)=0

We get rid of parentheses

-b+9+9=0

We add all the numbers together, and all the variables

-1b+18=0

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

-b=-18

b=-18/-1

b=+18

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