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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