b+42=3b

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Solution for b+42=3b equation: 



b+42=3b

We move all terms to the left:

b+42-(3b)=0

We add all the numbers together, and all the variables

-2b+42=0

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

-2b=-42

b=-42/-2

b=+21

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