42=7(b+3)

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Solution for 42=7(b+3) equation: 



42=7(b+3)

We move all terms to the left:

42-(7(b+3))=0



We calculate terms in parentheses: -(7(b+3)), so:

7(b+3)

We multiply parentheses

7b+21

Back to the equation:

-(7b+21)



We get rid of parentheses

-7b-21+42=0

We add all the numbers together, and all the variables

-7b+21=0

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

-7b=-21

b=-21/-7

b=+3

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