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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
7/(x^2)-(1/x)-36-6 = 0
7/(x^2)-x^-1-36-6 = 0
7*x^-2-x^-1-42 = 0
t_1 = x^-1
7*t_1^2-1*t_1^1-42 = 0
7*t_1^2-t_1-42 = 0
DELTA = (-1)^2-(-42*4*7)
DELTA = 1177
DELTA > 0
t_1 = (1177^(1/2)+1)/(2*7) or t_1 = (1-1177^(1/2))/(2*7)
t_1 = (1177^(1/2)+1)/14 or t_1 = (1-1177^(1/2))/14
t_1 = (1-1177^(1/2))/14
x^-1-((1-1177^(1/2))/14) = 0
1*x^-1 = (1-1177^(1/2))/14 // : 1
x^-1 = (1-1177^(1/2))/14
-1 < 0
1/(x^1) = (1-1177^(1/2))/14 // * x^1
1 = ((1-1177^(1/2))/14)*x^1 // : (1-1177^(1/2))/14
14*(1-1177^(1/2))^-1 = x^1
x = 14*(1-1177^(1/2))^-1
t_1 = (1177^(1/2)+1)/14
x^-1-((1177^(1/2)+1)/14) = 0
1*x^-1 = (1177^(1/2)+1)/14 // : 1
x^-1 = (1177^(1/2)+1)/14
-1 < 0
1/(x^1) = (1177^(1/2)+1)/14 // * x^1
1 = ((1177^(1/2)+1)/14)*x^1 // : (1177^(1/2)+1)/14
14*(1177^(1/2)+1)^-1 = x^1
x = 14*(1177^(1/2)+1)^-1
x in { 14*(1-1177^(1/2))^-1, 14*(1177^(1/2)+1)^-1 }
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