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39=9u-6
We move all terms to the left:
39-(9u-6)=0
We get rid of parentheses
-9u+6+39=0
We add all the numbers together, and all the variables
-9u+45=0
We move all terms containing u to the left, all other terms to the right
-9u=-45
u=-45/-9
u=+5
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