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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+3 = 2*x+9/5 // - 2*x+9/5
6/x-(2*x)-(9/5)+3 = 0
6/x-2*x-9/5+3 = 0
6*x^-1-2*x^1+6/5*x^0 = 0
(6/5*x^1-2*x^2+6*x^0)/(x^1) = 0 // * x^2
x^1*(6/5*x^1-2*x^2+6*x^0) = 0
x^1
(6/5)*x-2*x^2+6 = 0
(6/5)*x-2*x^2+6 = 0
DELTA = (6/5)^2-(-2*4*6)
DELTA = 1236/25
DELTA > 0
x = ((1236/25)^(1/2)-(6/5))/(-2*2) or x = (-(6/5)-(1236/25)^(1/2))/(-2*2)
x = ((1236/25)^(1/2)-6/5)/(-4) or x = ((1236/25)^(1/2)+6/5)/4
x in { ((1236/25)^(1/2)-6/5)/(-4), ((1236/25)^(1/2)+6/5)/4}
x in { ((1236/25)^(1/2)-6/5)/(-4), ((1236/25)^(1/2)+6/5)/4 }
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