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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8/7)*x+28 = 8/x-(2/7)+4 // - 8/x-(2/7)+4
(8/7)*x-(8/x)+2/7-4+28 = 0
(8/7)*x-8*x^-1+2/7-4+28 = 0
8/7*x^1-8*x^-1+170/7*x^0 = 0
(8/7*x^2+170/7*x^1-8*x^0)/(x^1) = 0 // * x^2
x^1*(8/7*x^2+170/7*x^1-8*x^0) = 0
x^1
(8/7)*x^2+(170/7)*x-8 = 0
(8/7)*x^2+(170/7)*x-8 = 0
DELTA = (170/7)^2-(-8*4*(8/7))
DELTA = 30692/49
DELTA > 0
x = ((30692/49)^(1/2)-(170/7))/(2*(8/7)) or x = (-(170/7)-(30692/49)^(1/2))/(2*(8/7))
x = 7/16*((30692/49)^(1/2)-170/7) or x = -7/16*((30692/49)^(1/2)+170/7)
x in { -7/16*((30692/49)^(1/2)+170/7), 7/16*((30692/49)^(1/2)-170/7)}
x in { -7/16*((30692/49)^(1/2)+170/7), 7/16*((30692/49)^(1/2)-170/7) }
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