9=8u-5u

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Solution for 9=8u-5u equation: 



9=8u-5u

We move all terms to the left:

9-(8u-5u)=0

We add all the numbers together, and all the variables

-(+3u)+9=0

We get rid of parentheses

-3u+9=0

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

-3u=-9

u=-9/-3

u=+3

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