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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9/7)*x+35 = 6/x-(3/7)+5 // - 6/x-(3/7)+5
(9/7)*x-(6/x)+3/7-5+35 = 0
(9/7)*x-6*x^-1+3/7-5+35 = 0
9/7*x^1-6*x^-1+213/7*x^0 = 0
(9/7*x^2+213/7*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(9/7*x^2+213/7*x^1-6*x^0) = 0
x^1
(9/7)*x^2+(213/7)*x-6 = 0
(9/7)*x^2+(213/7)*x-6 = 0
DELTA = (213/7)^2-(-6*4*(9/7))
DELTA = 46881/49
DELTA > 0
x = ((46881/49)^(1/2)-(213/7))/(2*(9/7)) or x = (-(213/7)-(46881/49)^(1/2))/(2*(9/7))
x = 7/18*((46881/49)^(1/2)-213/7) or x = -7/18*((46881/49)^(1/2)+213/7)
x in { -7/18*((46881/49)^(1/2)+213/7), 7/18*((46881/49)^(1/2)-213/7)}
x in { -7/18*((46881/49)^(1/2)+213/7), 7/18*((46881/49)^(1/2)-213/7) }
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