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x^2-(48/X)-20-8 = 0
x^2-48*X^-1-20-8 = 0
1*x^2 = -(-48*X^-1-28) // : 1
x^2 = 28-(-48*X^-1)
x^2 = 48*X^-1+28 // ^ 1/2
abs(x) = (48*X^-1+28)^(1/2)
x = (48*X^-1+28)^(1/2) or x = -(48*X^-1+28)^(1/2)
x in { (48*X^-1+28)^(1/2), -(48*X^-1+28)^(1/2) }
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