42=-7(1x-3)

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Solution for 42=-7(1x-3) equation: 



42=-7(1x-3)

We move all terms to the left:

42-(-7(1x-3))=0

We add all the numbers together, and all the variables

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



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

-7(x-3)

We multiply parentheses

-7x+21

Back to the equation:

-(-7x+21)



We get rid of parentheses

7x-21+42=0

We add all the numbers together, and all the variables

7x+21=0

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

7x=-21

x=-21/7

x=-3

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