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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/3 = x+3/x-7 // - x+3/x-7
2/3-x-(3/x)+7 = 0
2/3-x-3*x^-1+7 = 0
23/3*x^0-1*x^1-3*x^-1 = 0
(23/3*x^1-1*x^2-3*x^0)/(x^1) = 0 // * x^2
x^1*(23/3*x^1-1*x^2-3*x^0) = 0
x^1
(23/3)*x-x^2-3 = 0
(23/3)*x-x^2-3 = 0
DELTA = (23/3)^2-(-3*(-1)*4)
DELTA = 421/9
DELTA > 0
x = ((421/9)^(1/2)-(23/3))/(-1*2) or x = (-(23/3)-(421/9)^(1/2))/(-1*2)
x = ((421/9)^(1/2)-23/3)/(-2) or x = ((421/9)^(1/2)+23/3)/2
x in { ((421/9)^(1/2)-23/3)/(-2), ((421/9)^(1/2)+23/3)/2}
x in { ((421/9)^(1/2)-23/3)/(-2), ((421/9)^(1/2)+23/3)/2 }
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