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18u+20+20=13u-20
We move all terms to the left:
18u+20+20-(13u-20)=0
We add all the numbers together, and all the variables
18u-(13u-20)+40=0
We get rid of parentheses
18u-13u+20+40=0
We add all the numbers together, and all the variables
5u+60=0
We move all terms containing u to the left, all other terms to the right
5u=-60
u=-60/5
u=-12
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