9=15-b

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Solution for 9=15-b equation: 



9=15-b

We move all terms to the left:

9-(15-b)=0

We add all the numbers together, and all the variables

-(-1b+15)+9=0

We get rid of parentheses

1b-15+9=0

We add all the numbers together, and all the variables

b-6=0

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

b=6

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