-8+2u=13+9u

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Solution for -8+2u=13+9u equation: 



-8+2u=13+9u

We move all terms to the left:

-8+2u-(13+9u)=0

We add all the numbers together, and all the variables

2u-(9u+13)-8=0

We get rid of parentheses

2u-9u-13-8=0

We add all the numbers together, and all the variables

-7u-21=0

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

-7u=21

u=21/-7

u=-3

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