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15=2u+u
We move all terms to the left:
15-(2u+u)=0
We add all the numbers together, and all the variables
-(+3u)+15=0
We get rid of parentheses
-3u+15=0
We move all terms containing u to the left, all other terms to the right
-3u=-15
u=-15/-3
u=+5
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