7b-b+3b-7b-b=9

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Solution for 7b-b+3b-7b-b=9 equation: 



7b-b+3b-7b-b=9

We move all terms to the left:

7b-b+3b-7b-b-(9)=0

We add all the numbers together, and all the variables

b-9=0

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

b=9

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