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U=4U-10
We move all terms to the left:
U-(4U-10)=0
We get rid of parentheses
U-4U+10=0
We add all the numbers together, and all the variables
-3U+10=0
We move all terms containing U to the left, all other terms to the right
-3U=-10
U=-10/-3
U=3+1/3
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