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10u+20=1+11u
We move all terms to the left:
10u+20-(1+11u)=0
We add all the numbers together, and all the variables
10u-(11u+1)+20=0
We get rid of parentheses
10u-11u-1+20=0
We add all the numbers together, and all the variables
-1u+19=0
We move all terms containing u to the left, all other terms to the right
-u=-19
u=-19/-1
u=+19
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