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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2/x)+7 = x-((6/3)*x)+21 // - x-((6/3)*x)+21
x-x+(6/3)*x-(2/x)-21+7 = 0
x-x+(6/3)*x-2*x^-1-21+7 = 0
2*x^1-2*x^-1-14*x^0 = 0
(2*x^2-14*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-14*x^1-2*x^0) = 0
x^1
2*x^2-14*x-2 = 0
2*x^2-14*x-2 = 0
DELTA = (-14)^2-(-2*2*4)
DELTA = 212
DELTA > 0
x = (212^(1/2)+14)/(2*2) or x = (14-212^(1/2))/(2*2)
x = (2*53^(1/2)+14)/4 or x = (14-2*53^(1/2))/4
x in { (14-2*53^(1/2))/4, (2*53^(1/2)+14)/4}
x in { (14-2*53^(1/2))/4, (2*53^(1/2)+14)/4 }
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