2b-42=7b-21

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Solution for 2b-42=7b-21 equation: 



2b-42=7b-21

We move all terms to the left:

2b-42-(7b-21)=0

We get rid of parentheses

2b-7b+21-42=0

We add all the numbers together, and all the variables

-5b-21=0

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

-5b=21

b=21/-5

b=-4+1/5

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