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3u-u+2u+3u+u=18
We move all terms to the left:
3u-u+2u+3u+u-(18)=0
We add all the numbers together, and all the variables
8u-18=0
We move all terms containing u to the left, all other terms to the right
8u=18
u=18/8
u=2+1/4
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