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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(6/x)+2 = 5/7 // - 5/7
x-(6/x)-(5/7)+2 = 0
x-6*x^-1-5/7+2 = 0
1*x^1-6*x^-1+9/7*x^0 = 0
(1*x^2+9/7*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+9/7*x^1-6*x^0) = 0
x^1
x^2+(9/7)*x-6 = 0
x^2+(9/7)*x-6 = 0
DELTA = (9/7)^2-(-6*1*4)
DELTA = 1257/49
DELTA > 0
x = ((1257/49)^(1/2)-(9/7))/(1*2) or x = (-(9/7)-(1257/49)^(1/2))/(1*2)
x = ((1257/49)^(1/2)-9/7)/2 or x = (-((1257/49)^(1/2)+9/7))/2
x in { (-((1257/49)^(1/2)+9/7))/2, ((1257/49)^(1/2)-9/7)/2}
x in { (-((1257/49)^(1/2)+9/7))/2, ((1257/49)^(1/2)-9/7)/2 }
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