7b+13=9b-20

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Solution for 7b+13=9b-20 equation: 



7b+13=9b-20

We move all terms to the left:

7b+13-(9b-20)=0

We get rid of parentheses

7b-9b+20+13=0

We add all the numbers together, and all the variables

-2b+33=0

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

-2b=-33

b=-33/-2

b=16+1/2

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