9=b-15

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Solution for 9=b-15 equation: 



9=b-15

We move all terms to the left:

9-(b-15)=0

We get rid of parentheses

-b+15+9=0

We add all the numbers together, and all the variables

-1b+24=0

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

-b=-24

b=-24/-1

b=+24

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