3+9b=13+7b

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Solution for 3+9b=13+7b equation: 



3+9b=13+7b

We move all terms to the left:

3+9b-(13+7b)=0

We add all the numbers together, and all the variables

9b-(7b+13)+3=0

We get rid of parentheses

9b-7b-13+3=0

We add all the numbers together, and all the variables

2b-10=0

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

2b=10

b=10/2

b=5

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