3b=30-7b

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Solution for 3b=30-7b equation: 



3b=30-7b

We move all terms to the left:

3b-(30-7b)=0

We add all the numbers together, and all the variables

3b-(-7b+30)=0

We get rid of parentheses

3b+7b-30=0

We add all the numbers together, and all the variables

10b-30=0

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

10b=30

b=30/10

b=3

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