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u=6-2u
We move all terms to the left:
u-(6-2u)=0
We add all the numbers together, and all the variables
u-(-2u+6)=0
We get rid of parentheses
u+2u-6=0
We add all the numbers together, and all the variables
3u-6=0
We move all terms containing u to the left, all other terms to the right
3u=6
u=6/3
u=2
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