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33=2u+9
We move all terms to the left:
33-(2u+9)=0
We get rid of parentheses
-2u-9+33=0
We add all the numbers together, and all the variables
-2u+24=0
We move all terms containing u to the left, all other terms to the right
-2u=-24
u=-24/-2
u=+12
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