420=-7(7x-4)

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Solution for 420=-7(7x-4) equation: 



420=-7(7x-4)

We move all terms to the left:

420-(-7(7x-4))=0



We calculate terms in parentheses: -(-7(7x-4)), so:

-7(7x-4)

We multiply parentheses

-49x+28

Back to the equation:

-(-49x+28)



We get rid of parentheses

49x-28+420=0

We add all the numbers together, and all the variables

49x+392=0

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

49x=-392

x=-392/49

x=-8

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