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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/7-(2/x) = 11/21 // - 11/21
x/7-(2/x)-(11/21) = 0
x/7-2*x^-1-11/21 = 0
1/7*x^1-2*x^-1-11/21*x^0 = 0
(1/7*x^2-11/21*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(1/7*x^2-11/21*x^1-2*x^0) = 0
x^1
(1/7)*x^2+(-11/21)*x-2 = 0
(1/7)*x^2+(-11/21)*x-2 = 0
DELTA = (-11/21)^2-(-2*4*(1/7))
DELTA = 625/441
DELTA > 0
x = ((625/441)^(1/2)-(-11/21))/(2*(1/7)) or x = (-(-11/21)-(625/441)^(1/2))/(2*(1/7))
x = 6 or x = -7/3
x in { -7/3, 6}
x in { -7/3, 6 }
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