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(u*10)*9=18
We move all terms to the left:
(u*10)*9-(18)=0
We add all the numbers together, and all the variables
(+u*10)*9-18=0
We multiply parentheses
90u-18=0
We move all terms containing u to the left, all other terms to the right
90u=18
u=18/90
u=1/5
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