12=19-u

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Solution for 12=19-u equation: 



12=19-u

We move all terms to the left:

12-(19-u)=0

We add all the numbers together, and all the variables

-(-1u+19)+12=0

We get rid of parentheses

1u-19+12=0

We add all the numbers together, and all the variables

u-7=0

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

u=7

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