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3u-4=4u-5
We move all terms to the left:
3u-4-(4u-5)=0
We get rid of parentheses
3u-4u+5-4=0
We add all the numbers together, and all the variables
-1u+1=0
We move all terms containing u to the left, all other terms to the right
-u=-1
u=-1/-1
u=1
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