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4-2u=11u-9
We move all terms to the left:
4-2u-(11u-9)=0
We get rid of parentheses
-2u-11u+9+4=0
We add all the numbers together, and all the variables
-13u+13=0
We move all terms containing u to the left, all other terms to the right
-13u=-13
u=-13/-13
u=1
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