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-20+20U=18+19U
We move all terms to the left:
-20+20U-(18+19U)=0
We add all the numbers together, and all the variables
20U-(19U+18)-20=0
We get rid of parentheses
20U-19U-18-20=0
We add all the numbers together, and all the variables
U-38=0
We move all terms containing U to the left, all other terms to the right
U=38
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