-9=b+-13

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Solution for -9=b+-13 equation: 



-9=b+-13

We move all terms to the left:

-9-(b+-13)=0

We add all the numbers together, and all the variables

-(b-13)-9=0

We get rid of parentheses

-b+13-9=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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