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5u+7=3u+11
We move all terms to the left:
5u+7-(3u+11)=0
We get rid of parentheses
5u-3u-11+7=0
We add all the numbers together, and all the variables
2u-4=0
We move all terms containing u to the left, all other terms to the right
2u=4
u=4/2
u=2
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