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20u+19=9u+19+11u
We move all terms to the left:
20u+19-(9u+19+11u)=0
We add all the numbers together, and all the variables
20u-(20u+19)+19=0
We get rid of parentheses
20u-20u-19+19=0
We add all the numbers together, and all the variables
=0
u=0/1
u=0
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