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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x+1/x-1 = 6*x-((13/2)*x)-7 // - 6*x-((13/2)*x)-7
3*x-(6*x)+(13/2)*x+1/x-1+7 = 0
3*x-6*x+(13/2)*x+1/x-1+7 = 0
7/2*x^1+1*x^-1+6*x^0 = 0
(7/2*x^2+6*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(7/2*x^2+6*x^1+1*x^0) = 0
x^1
(7/2)*x^2+6*x+1 = 0
(7/2)*x^2+6*x+1 = 0
DELTA = 6^2-(1*4*(7/2))
DELTA = 22
DELTA > 0
x = (22^(1/2)-6)/(2*(7/2)) or x = (-22^(1/2)-6)/(2*(7/2))
x = (22^(1/2)-6)/7 or x = (-(22^(1/2)+6))/7
x in { (-(22^(1/2)+6))/7, (22^(1/2)-6)/7}
x in { (-(22^(1/2)+6))/7, (22^(1/2)-6)/7 }
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