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20=u/5+8
We move all terms to the left:
20-(u/5+8)=0
We get rid of parentheses
-u/5-8+20=0
We multiply all the terms by the denominator
-u-8*5+20*5=0
We add all the numbers together, and all the variables
-1u+60=0
We move all terms containing u to the left, all other terms to the right
-u=-60
u=-60/-1
u=+60
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