7=-2+u

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Solution for 7=-2+u equation: 



7=-2+u

We move all terms to the left:

7-(-2+u)=0

We add all the numbers together, and all the variables

-(u-2)+7=0

We get rid of parentheses

-u+2+7=0

We add all the numbers together, and all the variables

-1u+9=0

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

-u=-9

u=-9/-1

u=+9

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