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20u-20=15u-8
We move all terms to the left:
20u-20-(15u-8)=0
We get rid of parentheses
20u-15u+8-20=0
We add all the numbers together, and all the variables
5u-12=0
We move all terms containing u to the left, all other terms to the right
5u=12
u=12/5
u=2+2/5
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