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11u=12u+20
We move all terms to the left:
11u-(12u+20)=0
We get rid of parentheses
11u-12u-20=0
We add all the numbers together, and all the variables
-1u-20=0
We move all terms containing u to the left, all other terms to the right
-u=20
u=20/-1
u=-20
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