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9=18u-9u
We move all terms to the left:
9-(18u-9u)=0
We add all the numbers together, and all the variables
-(+9u)+9=0
We get rid of parentheses
-9u+9=0
We move all terms containing u to the left, all other terms to the right
-9u=-9
u=-9/-9
u=1
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