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3u=4u-6
We move all terms to the left:
3u-(4u-6)=0
We get rid of parentheses
3u-4u+6=0
We add all the numbers together, and all the variables
-1u+6=0
We move all terms containing u to the left, all other terms to the right
-u=-6
u=-6/-1
u=+6
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