Answer
B=$\frac{2U-ET}{T}$
Work Step by Step
T=$\frac{2U}{B+E}$
(B+E)T=(B+E)$\frac{2U}{B+E}$
BT+ET=2U
BT=2U-ET
$\frac{BT}{T}$=$\frac{2U-ET}{T}$
B=$\frac{2U-ET}{T}$
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