u=2u+9

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Solution for u=2u+9 equation: 



u=2u+9

We move all terms to the left:

u-(2u+9)=0

We get rid of parentheses

u-2u-9=0

We add all the numbers together, and all the variables

-1u-9=0

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

-u=9

u=9/-1

u=-9

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