7b-8=9b

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Solution for 7b-8=9b equation: 



7b-8=9b

We move all terms to the left:

7b-8-(9b)=0

We add all the numbers together, and all the variables

-2b-8=0

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

-2b=8

b=8/-2

b=-4

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