9+u=4u-9

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Solution for 9+u=4u-9 equation: 



9+u=4u-9

We move all terms to the left:

9+u-(4u-9)=0

We get rid of parentheses

u-4u+9+9=0

We add all the numbers together, and all the variables

-3u+18=0

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

-3u=-18

u=-18/-3

u=+6

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