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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
167/x = x/130 // - x/130
167/x-(x/130) = 0
167*x^-1-1/130*x^1 = 0
(167*x^0-1/130*x^2)/(x^1) = 0 // * x^2
x^1*(167*x^0-1/130*x^2) = 0
x^1
(-1/130)*x^2+167 = 0
(-1/130)*x^2+167 = 0
DELTA = 0^2-(4*167*(-1/130))
DELTA = 334/65
DELTA > 0
x = ((334/65)^(1/2)+0)/(2*(-1/130)) or x = (0-(334/65)^(1/2))/(2*(-1/130))
x = -65*(334/65)^(1/2) or x = 65*(334/65)^(1/2)
x in { -65*(334/65)^(1/2), 65*(334/65)^(1/2)}
x in { -65*(334/65)^(1/2), 65*(334/65)^(1/2) }
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