3b=4b-9-7b

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Solution for 3b=4b-9-7b equation: 



3b=4b-9-7b

We move all terms to the left:

3b-(4b-9-7b)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3b+3b+9=0

We add all the numbers together, and all the variables

6b+9=0

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

6b=-9

b=-9/6

b=-1+1/2

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