13b-15b-8b=20

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Solution for 13b-15b-8b=20 equation: 



13b-15b-8b=20

We move all terms to the left:

13b-15b-8b-(20)=0

We add all the numbers together, and all the variables

-10b-20=0

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

-10b=20

b=20/-10

b=-2

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