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-7(U-6)=63
We move all terms to the left:
-7(U-6)-(63)=0
We multiply parentheses
-7U+42-63=0
We add all the numbers together, and all the variables
-7U-21=0
We move all terms containing U to the left, all other terms to the right
-7U=21
U=21/-7
U=-3
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