3b=9b-42

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Solution for 3b=9b-42 equation: 



3b=9b-42

We move all terms to the left:

3b-(9b-42)=0

We get rid of parentheses

3b-9b+42=0

We add all the numbers together, and all the variables

-6b+42=0

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

-6b=-42

b=-42/-6

b=+7

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