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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-1 = x-(6/2) // - x-(6/2)
3/x-x+6/2-1 = 0
3*x^-1-1*x^1+2*x^0 = 0
(2*x^1-1*x^2+3*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^1-1*x^2+3*x^0) = 0
x^1
2*x-x^2+3 = 0
2*x-x^2+3 = 0
DELTA = 2^2-(-1*3*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)-2)/(-1*2) or x = (-16^(1/2)-2)/(-1*2)
x = -1 or x = 3
x in { -1, 3}
x in { -1, 3 }
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