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9=7U-4
We move all terms to the left:
9-(7U-4)=0
We get rid of parentheses
-7U+4+9=0
We add all the numbers together, and all the variables
-7U+13=0
We move all terms containing U to the left, all other terms to the right
-7U=-13
U=-13/-7
U=1+6/7
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