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-7.7U=8.91
We move all terms to the left:
-7.7U-(8.91)=0
We add all the numbers together, and all the variables
-7.7U-8.91=0
We move all terms containing U to the left, all other terms to the right
-7.7U=8.91
U=8.91/-7.7
U=-1+1/6.36363636364
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