39=45-u

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Solution for 39=45-u equation: 



39=45-u

We move all terms to the left:

39-(45-u)=0

We add all the numbers together, and all the variables

-(-1u+45)+39=0

We get rid of parentheses

1u-45+39=0

We add all the numbers together, and all the variables

u-6=0

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

u=6

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