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