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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+7/x-(4/6)-6 = 0
x+7/x-2/3-6 = 0
1*x^1+7*x^-1-20/3*x^0 = 0
(1*x^2-20/3*x^1+7*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-20/3*x^1+7*x^0) = 0
x^1
x^2+(-20/3)*x+7 = 0
x^2+(-20/3)*x+7 = 0
DELTA = (-20/3)^2-(1*4*7)
DELTA = 148/9
DELTA > 0
x = ((148/9)^(1/2)-(-20/3))/(1*2) or x = (-(-20/3)-(148/9)^(1/2))/(1*2)
x = ((148/9)^(1/2)+20/3)/2 or x = (20/3-(148/9)^(1/2))/2
x in { (20/3-(148/9)^(1/2))/2, ((148/9)^(1/2)+20/3)/2}
x in { (20/3-(148/9)^(1/2))/2, ((148/9)^(1/2)+20/3)/2 }
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