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