-31=7(u+7)+3u

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Solution for -31=7(u+7)+3u equation: 



-31=7(u+7)+3u

We move all terms to the left:

-31-(7(u+7)+3u)=0



We calculate terms in parentheses: -(7(u+7)+3u), so:

7(u+7)+3u

We add all the numbers together, and all the variables

3u+7(u+7)

We multiply parentheses

3u+7u+49

We add all the numbers together, and all the variables

10u+49

Back to the equation:

-(10u+49)



We get rid of parentheses

-10u-49-31=0

We add all the numbers together, and all the variables

-10u-80=0

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

-10u=80

u=80/-10

u=-8

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