13-7b=20

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Solution for 13-7b=20 equation: 



13-7b=20

We move all terms to the left:

13-7b-(20)=0

We add all the numbers together, and all the variables

-7b-7=0

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

-7b=7

b=7/-7

b=-1

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