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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(16/15)*x+5/x-45-3 = 0
16/15*x^1+5*x^-1-48*x^0 = 0
(16/15*x^2-48*x^1+5*x^0)/(x^1) = 0 // * x^2
x^1*(16/15*x^2-48*x^1+5*x^0) = 0
x^1
(16/15)*x^2-48*x+5 = 0
(16/15)*x^2-48*x+5 = 0
DELTA = (-48)^2-(4*5*(16/15))
DELTA = 6848/3
DELTA > 0
x = ((6848/3)^(1/2)+48)/(2*(16/15)) or x = (48-(6848/3)^(1/2))/(2*(16/15))
x = 15/32*((6848/3)^(1/2)+48) or x = 15/32*(48-(6848/3)^(1/2))
x in { 15/32*(48-(6848/3)^(1/2)), 15/32*((6848/3)^(1/2)+48)}
x in { 15/32*(48-(6848/3)^(1/2)), 15/32*((6848/3)^(1/2)+48) }
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