-7u-31=9(u+9)

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Solution for -7u-31=9(u+9) equation: 



-7u-31=9(u+9)

We move all terms to the left:

-7u-31-(9(u+9))=0



We calculate terms in parentheses: -(9(u+9)), so:

9(u+9)

We multiply parentheses

9u+81

Back to the equation:

-(9u+81)



We get rid of parentheses

-7u-9u-81-31=0

We add all the numbers together, and all the variables

-16u-112=0

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

-16u=112

u=112/-16

u=-7

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