4b+5b+15=5b+7b

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Solution for 4b+5b+15=5b+7b equation: 



4b+5b+15=5b+7b

We move all terms to the left:

4b+5b+15-(5b+7b)=0

We add all the numbers together, and all the variables

4b+5b-(+12b)+15=0

We add all the numbers together, and all the variables

9b-(+12b)+15=0

We get rid of parentheses

9b-12b+15=0

We add all the numbers together, and all the variables

-3b+15=0

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

-3b=-15

b=-15/-3

b=+5

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