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