8b+5b=-91

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Solution for 8b+5b=-91 equation: 



8b+5b=-91

We move all terms to the left:

8b+5b-(-91)=0

We add all the numbers together, and all the variables

13b+91=0

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

13b=-91

b=-91/13

b=-7

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