13=2u-1

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Solution for 13=2u-1 equation: 



13=2u-1

We move all terms to the left:

13-(2u-1)=0

We get rid of parentheses

-2u+1+13=0

We add all the numbers together, and all the variables

-2u+14=0

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

-2u=-14

u=-14/-2

u=+7

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