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54=14u-5u
We move all terms to the left:
54-(14u-5u)=0
We add all the numbers together, and all the variables
-(+9u)+54=0
We get rid of parentheses
-9u+54=0
We move all terms containing u to the left, all other terms to the right
-9u=-54
u=-54/-9
u=+6
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