7=8+u

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Solution for 7=8+u equation: 



7=8+u

We move all terms to the left:

7-(8+u)=0

We add all the numbers together, and all the variables

-(u+8)+7=0

We get rid of parentheses

-u-8+7=0

We add all the numbers together, and all the variables

-1u-1=0

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

-u=1

u=1/-1

u=-1

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