-31=3(u+3)-8u

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Solution for -31=3(u+3)-8u equation: 



-31=3(u+3)-8u

We move all terms to the left:

-31-(3(u+3)-8u)=0



We calculate terms in parentheses: -(3(u+3)-8u), so:

3(u+3)-8u

We add all the numbers together, and all the variables

-8u+3(u+3)

We multiply parentheses

-8u+3u+9

We add all the numbers together, and all the variables

-5u+9

Back to the equation:

-(-5u+9)



We get rid of parentheses

5u-9-31=0

We add all the numbers together, and all the variables

5u-40=0

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

5u=40

u=40/5

u=8

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