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13u-20=11u-8
We move all terms to the left:
13u-20-(11u-8)=0
We get rid of parentheses
13u-11u+8-20=0
We add all the numbers together, and all the variables
2u-12=0
We move all terms containing u to the left, all other terms to the right
2u=12
u=12/2
u=6
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