42=42-9b

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Solution for 42=42-9b equation: 



42=42-9b

We move all terms to the left:

42-(42-9b)=0

We add all the numbers together, and all the variables

-(-9b+42)+42=0

We get rid of parentheses

9b-42+42=0

We add all the numbers together, and all the variables

9b=0

b=0/9

b=0

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