3b+15=7b-13

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Solution for 3b+15=7b-13 equation: 



3b+15=7b-13

We move all terms to the left:

3b+15-(7b-13)=0

We get rid of parentheses

3b-7b+13+15=0

We add all the numbers together, and all the variables

-4b+28=0

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

-4b=-28

b=-28/-4

b=+7

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