2u=u-9

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Solution for 2u=u-9 equation: 



2u=u-9

We move all terms to the left:

2u-(u-9)=0

We get rid of parentheses

2u-u+9=0

We add all the numbers together, and all the variables

u+9=0

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

u=-9

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