15=13u-8u

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Solution for 15=13u-8u equation: 



15=13u-8u

We move all terms to the left:

15-(13u-8u)=0

We add all the numbers together, and all the variables

-(+5u)+15=0

We get rid of parentheses

-5u+15=0

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

-5u=-15

u=-15/-5

u=+3

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