-9=4b-7b

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Solution for -9=4b-7b equation: 



-9=4b-7b

We move all terms to the left:

-9-(4b-7b)=0

We add all the numbers together, and all the variables

-(-3b)-9=0

We get rid of parentheses

3b-9=0

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

3b=9

b=9/3

b=3

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