28=-7(5+u)

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Solution for 28=-7(5+u) equation: 



28=-7(5+u)

We move all terms to the left:

28-(-7(5+u))=0

We add all the numbers together, and all the variables

-(-7(u+5))+28=0



We calculate terms in parentheses: -(-7(u+5)), so:

-7(u+5)

We multiply parentheses

-7u-35

Back to the equation:

-(-7u-35)



We get rid of parentheses

7u+35+28=0

We add all the numbers together, and all the variables

7u+63=0

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

7u=-63

u=-63/7

u=-9

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