-13=b-9

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Solution for -13=b-9 equation: 



-13=b-9

We move all terms to the left:

-13-(b-9)=0

We get rid of parentheses

-b+9-13=0

We add all the numbers together, and all the variables

-1b-4=0

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

-b=4

b=4/-1

b=-4

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