12=9u-5u

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Solution for 12=9u-5u equation: 



12=9u-5u

We move all terms to the left:

12-(9u-5u)=0

We add all the numbers together, and all the variables

-(+4u)+12=0

We get rid of parentheses

-4u+12=0

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

-4u=-12

u=-12/-4

u=+3

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