-2=7-u

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Solution for -2=7-u equation: 



-2=7-u

We move all terms to the left:

-2-(7-u)=0

We add all the numbers together, and all the variables

-(-1u+7)-2=0

We get rid of parentheses

1u-7-2=0

We add all the numbers together, and all the variables

u-9=0

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

u=9

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