12-2u=9+45

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



12-2u=9+45

We move all terms to the left:

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

We add all the numbers together, and all the variables

-2u+12-54=0

We add all the numbers together, and all the variables

-2u-42=0

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

-2u=42

u=42/-2

u=-21

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