12=2u+45+9u

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Solution for 12=2u+45+9u equation: 



12=2u+45+9u

We move all terms to the left:

12-(2u+45+9u)=0

We add all the numbers together, and all the variables

-(11u+45)+12=0

We get rid of parentheses

-11u-45+12=0

We add all the numbers together, and all the variables

-11u-33=0

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

-11u=33

u=33/-11

u=-3

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