13=6+u

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Solution for 13=6+u equation: 



13=6+u

We move all terms to the left:

13-(6+u)=0

We add all the numbers together, and all the variables

-(u+6)+13=0

We get rid of parentheses

-u-6+13=0

We add all the numbers together, and all the variables

-1u+7=0

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

-u=-7

u=-7/-1

u=+7

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