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-18u-19=-20u+5
We move all terms to the left:
-18u-19-(-20u+5)=0
We get rid of parentheses
-18u+20u-5-19=0
We add all the numbers together, and all the variables
2u-24=0
We move all terms containing u to the left, all other terms to the right
2u=24
u=24/2
u=12
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