7b+15=9b-15

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Solution for 7b+15=9b-15 equation: 



7b+15=9b-15

We move all terms to the left:

7b+15-(9b-15)=0

We get rid of parentheses

7b-9b+15+15=0

We add all the numbers together, and all the variables

-2b+30=0

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

-2b=-30

b=-30/-2

b=+15

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