13=3+u/2

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Solution for 13=3+u/2 equation: 



13=3+u/2

We move all terms to the left:

13-(3+u/2)=0

We add all the numbers together, and all the variables

-(u/2+3)+13=0

We get rid of parentheses

-u/2-3+13=0

We multiply all the terms by the denominator


-u-3*2+13*2=0

We add all the numbers together, and all the variables

-1u+20=0

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

-u=-20

u=-20/-1

u=+20

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