-42=-7(u-4)

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Solution for -42=-7(u-4) equation: 



-42=-7(u-4)

We move all terms to the left:

-42-(-7(u-4))=0



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

-7(u-4)

We multiply parentheses

-7u+28

Back to the equation:

-(-7u+28)



We get rid of parentheses

7u-28-42=0

We add all the numbers together, and all the variables

7u-70=0

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

7u=70

u=70/7

u=10

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