13u-13=39u-39

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Solution for 13u-13=39u-39 equation: 



13u-13=39u-39

We move all terms to the left:

13u-13-(39u-39)=0

We get rid of parentheses

13u-39u+39-13=0

We add all the numbers together, and all the variables

-26u+26=0

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

-26u=-26

u=-26/-26

u=1

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