7b-9=8b

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Solution for 7b-9=8b equation: 



7b-9=8b

We move all terms to the left:

7b-9-(8b)=0

We add all the numbers together, and all the variables

-1b-9=0

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

-b=9

b=9/-1

b=-9

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