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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(8/x) = 5/7 // - 5/7
x-(8/x)-(5/7) = 0
x-8*x^-1-5/7 = 0
1*x^1-8*x^-1-5/7*x^0 = 0
(1*x^2-5/7*x^1-8*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-5/7*x^1-8*x^0) = 0
x^1
x^2+(-5/7)*x-8 = 0
x^2+(-5/7)*x-8 = 0
DELTA = (-5/7)^2-(-8*1*4)
DELTA = 1593/49
DELTA > 0
x = ((1593/49)^(1/2)-(-5/7))/(1*2) or x = (-(-5/7)-(1593/49)^(1/2))/(1*2)
x = ((1593/49)^(1/2)+5/7)/2 or x = (5/7-(1593/49)^(1/2))/2
x in { (5/7-(1593/49)^(1/2))/2, ((1593/49)^(1/2)+5/7)/2}
x in { (5/7-(1593/49)^(1/2))/2, ((1593/49)^(1/2)+5/7)/2 }
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