13u-9u+u+3u+1=9

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Solution for 13u-9u+u+3u+1=9 equation: 



13u-9u+u+3u+1=9

We move all terms to the left:

13u-9u+u+3u+1-(9)=0

We add all the numbers together, and all the variables

8u-8=0

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

8u=8

u=8/8

u=1

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