-19=9-7u

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Solution for -19=9-7u equation: 



-19=9-7u

We move all terms to the left:

-19-(9-7u)=0

We add all the numbers together, and all the variables

-(-7u+9)-19=0

We get rid of parentheses

7u-9-19=0

We add all the numbers together, and all the variables

7u-28=0

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

7u=28

u=28/7

u=4

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