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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/3)*x-(5/x) = 7/10-((3/2)*x)+1 // - 7/10-((3/2)*x)+1
(2/3)*x+(3/2)*x-(5/x)-(7/10)-1 = 0
(2/3)*x+(3/2)*x-5*x^-1-7/10-1 = 0
13/6*x^1-5*x^-1-17/10*x^0 = 0
(13/6*x^2-17/10*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(13/6*x^2-17/10*x^1-5*x^0) = 0
x^1
(13/6)*x^2+(-17/10)*x-5 = 0
(13/6)*x^2+(-17/10)*x-5 = 0
DELTA = (-17/10)^2-(-5*4*(13/6))
DELTA = 13867/300
DELTA > 0
x = ((13867/300)^(1/2)-(-17/10))/(2*(13/6)) or x = (-(-17/10)-(13867/300)^(1/2))/(2*(13/6))
x = 3/13*((13867/300)^(1/2)+17/10) or x = 3/13*(17/10-(13867/300)^(1/2))
x in { 3/13*(17/10-(13867/300)^(1/2)), 3/13*((13867/300)^(1/2)+17/10)}
x in { 3/13*(17/10-(13867/300)^(1/2)), 3/13*((13867/300)^(1/2)+17/10) }
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