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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(21/3)*x-2 = 7/x // - 7/x
(21/3)*x-(7/x)-2 = 0
(21/3)*x-7*x^-1-2 = 0
7*x^1-7*x^-1-2*x^0 = 0
(7*x^2-2*x^1-7*x^0)/(x^1) = 0 // * x^2
x^1*(7*x^2-2*x^1-7*x^0) = 0
x^1
7*x^2-2*x-7 = 0
7*x^2-2*x-7 = 0
DELTA = (-2)^2-(-7*4*7)
DELTA = 200
DELTA > 0
x = (200^(1/2)+2)/(2*7) or x = (2-200^(1/2))/(2*7)
x = (10*2^(1/2)+2)/14 or x = (2-10*2^(1/2))/14
x in { (2-10*2^(1/2))/14, (10*2^(1/2)+2)/14}
x in { (2-10*2^(1/2))/14, (10*2^(1/2)+2)/14 }
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