7=19+u

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Solution for 7=19+u equation: 



7=19+u

We move all terms to the left:

7-(19+u)=0

We add all the numbers together, and all the variables

-(u+19)+7=0

We get rid of parentheses

-u-19+7=0

We add all the numbers together, and all the variables

-1u-12=0

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

-u=12

u=12/-1

u=-12

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