-13=4+b

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Solution for -13=4+b equation: 



-13=4+b

We move all terms to the left:

-13-(4+b)=0

We add all the numbers together, and all the variables

-(b+4)-13=0

We get rid of parentheses

-b-4-13=0

We add all the numbers together, and all the variables

-1b-17=0

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

-b=17

b=17/-1

b=-17

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