b+15=4b-9

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Solution for b+15=4b-9 equation: 



b+15=4b-9

We move all terms to the left:

b+15-(4b-9)=0

We get rid of parentheses

b-4b+9+15=0

We add all the numbers together, and all the variables

-3b+24=0

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

-3b=-24

b=-24/-3

b=+8

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