2u-9=12-u.

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Solution for 2u-9=12-u. equation: 



2u-9=12-u.

We move all terms to the left:

2u-9-(12-u.)=0

We add all the numbers together, and all the variables

2u-(-u.+12)-9=0

We get rid of parentheses

2u+u.-12-9=0

We add all the numbers together, and all the variables

2u+u.-21=0

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

2u+u.=21

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