13=5+2u

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Solution for 13=5+2u equation: 



13=5+2u

We move all terms to the left:

13-(5+2u)=0

We add all the numbers together, and all the variables

-(2u+5)+13=0

We get rid of parentheses

-2u-5+13=0

We add all the numbers together, and all the variables

-2u+8=0

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

-2u=-8

u=-8/-2

u=+4

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