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3=2u-9
We move all terms to the left:
3-(2u-9)=0
We get rid of parentheses
-2u+9+3=0
We add all the numbers together, and all the variables
-2u+12=0
We move all terms containing u to the left, all other terms to the right
-2u=-12
u=-12/-2
u=+6
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