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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+3 = 5*x-(7/x) // - 5*x-(7/x)
2/x-(5*x)+7/x+3 = 0
2/x-5*x+7/x+3 = 0
9*x^-1-5*x^1+3*x^0 = 0
(3*x^1-5*x^2+9*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^1-5*x^2+9*x^0) = 0
x^1
3*x-5*x^2+9 = 0
3*x-5*x^2+9 = 0
DELTA = 3^2-(-5*4*9)
DELTA = 189
DELTA > 0
x = (189^(1/2)-3)/(-5*2) or x = (-189^(1/2)-3)/(-5*2)
x = (3*21^(1/2)-3)/(-10) or x = (-3*21^(1/2)-3)/(-10)
x in { (3*21^(1/2)-3)/(-10), (-3*21^(1/2)-3)/(-10)}
x in { (3*21^(1/2)-3)/(-10), (-3*21^(1/2)-3)/(-10) }
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