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Answer:
x = 12 ; 23 units each side
Step-by-step explanation:
Δ STU is equilateral ⇒ ST = TU = SU
ST = 2x - 1
SU = 5x - 37
TU = x + 11
2x - 1 = x + 11 ⇒ x = 12
ST = 2(12) - 1 = 23 units
SU = 5(12) - 37 = 23 units
TU = 12 + 11 = 23 units
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