3b+15=7b-9

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Solution for 3b+15=7b-9 equation: 



3b+15=7b-9

We move all terms to the left:

3b+15-(7b-9)=0

We get rid of parentheses

3b-7b+9+15=0

We add all the numbers together, and all the variables

-4b+24=0

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

-4b=-24

b=-24/-4

b=+6

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