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12=u+2u
We move all terms to the left:
12-(u+2u)=0
We add all the numbers together, and all the variables
-(+3u)+12=0
We get rid of parentheses
-3u+12=0
We move all terms containing u to the left, all other terms to the right
-3u=-12
u=-12/-3
u=+4
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