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18u=20u-4
We move all terms to the left:
18u-(20u-4)=0
We get rid of parentheses
18u-20u+4=0
We add all the numbers together, and all the variables
-2u+4=0
We move all terms containing u to the left, all other terms to the right
-2u=-4
u=-4/-2
u=+2
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