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x in (-oo:+oo)
550/865 = ((15*x)/24)*x // - ((15*x)/24)*x
550/865-(((15*x)/24)*x) = 0
(-5/8)*x^2+550/865 = 0
-5/8*x^2 = -110/173 // : -5/8
x^2 = 176/173
x^2 = 176/173 // ^ 1/2
abs(x) = (176/173)^(1/2)
x = (176/173)^(1/2) or x = -(176/173)^(1/2)
x in { (176/173)^(1/2), -(176/173)^(1/2) }
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