13=3+2u

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Solution for 13=3+2u equation: 



13=3+2u

We move all terms to the left:

13-(3+2u)=0

We add all the numbers together, and all the variables

-(2u+3)+13=0

We get rid of parentheses

-2u-3+13=0

We add all the numbers together, and all the variables

-2u+10=0

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

-2u=-10

u=-10/-2

u=+5

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