-13b-13=15-20b

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Solution for -13b-13=15-20b equation: 



-13b-13=15-20b

We move all terms to the left:

-13b-13-(15-20b)=0

We add all the numbers together, and all the variables

-13b-(-20b+15)-13=0

We get rid of parentheses

-13b+20b-15-13=0

We add all the numbers together, and all the variables

7b-28=0

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

7b=28

b=28/7

b=4

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