u-u+3u-u=18

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Solution for u-u+3u-u=18 equation: 



u-u+3u-u=18

We move all terms to the left:

u-u+3u-u-(18)=0

We add all the numbers together, and all the variables

2u-18=0

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

2u=18

u=18/2

u=9

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