b=2b-42

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Solution for b=2b-42 equation: 



b=2b-42

We move all terms to the left:

b-(2b-42)=0

We get rid of parentheses

b-2b+42=0

We add all the numbers together, and all the variables

-1b+42=0

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

-b=-42

b=-42/-1

b=+42

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