13=18-u

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Solution for 13=18-u equation: 



13=18-u

We move all terms to the left:

13-(18-u)=0

We add all the numbers together, and all the variables

-(-1u+18)+13=0

We get rid of parentheses

1u-18+13=0

We add all the numbers together, and all the variables

u-5=0

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

u=5

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