10u-3u-9=9u+9

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Solution for 10u-3u-9=9u+9 equation: 



10u-3u-9=9u+9

We move all terms to the left:

10u-3u-9-(9u+9)=0

We add all the numbers together, and all the variables

7u-(9u+9)-9=0

We get rid of parentheses

7u-9u-9-9=0

We add all the numbers together, and all the variables

-2u-18=0

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

-2u=18

u=18/-2

u=-9

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