-3b-9=-7b+7

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



-3b-9=-7b+7

We move all terms to the left:

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

4b-16=0

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

4b=16

b=16/4

b=4

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