42=3(-7+3x)

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Solution for 42=3(-7+3x) equation: 



42=3(-7+3x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

3(3x-7)

We multiply parentheses

9x-21

Back to the equation:

-(9x-21)



We get rid of parentheses

-9x+21+42=0

We add all the numbers together, and all the variables

-9x+63=0

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

-9x=-63

x=-63/-9

x=+7

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