6=9u-3u

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Solution for 6=9u-3u equation: 



6=9u-3u

We move all terms to the left:

6-(9u-3u)=0

We add all the numbers together, and all the variables

-(+6u)+6=0

We get rid of parentheses

-6u+6=0

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

-6u=-6

u=-6/-6

u=1

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