-31=-7u+5(u-3)

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Solution for -31=-7u+5(u-3) equation: 



-31=-7u+5(u-3)

We move all terms to the left:

-31-(-7u+5(u-3))=0



We calculate terms in parentheses: -(-7u+5(u-3)), so:

-7u+5(u-3)

We multiply parentheses

-7u+5u-15

We add all the numbers together, and all the variables

-2u-15

Back to the equation:

-(-2u-15)



We get rid of parentheses

2u+15-31=0

We add all the numbers together, and all the variables

2u-16=0

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

2u=16

u=16/2

u=8

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