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18u-4=19u-9
We move all terms to the left:
18u-4-(19u-9)=0
We get rid of parentheses
18u-19u+9-4=0
We add all the numbers together, and all the variables
-1u+5=0
We move all terms containing u to the left, all other terms to the right
-u=-5
u=-5/-1
u=+5
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