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(-1+3U)=140
We move all terms to the left:
(-1+3U)-(140)=0
We add all the numbers together, and all the variables
(3U-1)-140=0
We get rid of parentheses
3U-1-140=0
We add all the numbers together, and all the variables
3U-141=0
We move all terms containing U to the left, all other terms to the right
3U=141
U=141/3
U=47
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