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u+11=5u-9
We move all terms to the left:
u+11-(5u-9)=0
We get rid of parentheses
u-5u+9+11=0
We add all the numbers together, and all the variables
-4u+20=0
We move all terms containing u to the left, all other terms to the right
-4u=-20
u=-20/-4
u=+5
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