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u in (-oo:+oo)
100-(((16*u)/17)*u)-5 = 0
(-16/17)*u^2-5+100 = 0
-16/17*u^2 = -95 // : -16/17
u^2 = 1615/16
u^2 = 1615/16 // ^ 1/2
abs(u) = (1615/16)^(1/2)
u = (1615/16)^(1/2) or u = -(1615/16)^(1/2)
u in { (1615/16)^(1/2), -(1615/16)^(1/2) }
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