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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)
1/x-(1/(x^2))-(5/36) = 0
1/x-x^-2-5/36 = 0
x^-1-x^-2-5/36 = 0
t_1 = x^-1
1*t_1^1-1*t_1^2-5/36 = 0
t_1-t_1^2-5/36 = 0
DELTA = 1^2-(-1*(-5/36)*4)
DELTA = 4/9
DELTA > 0
t_1 = ((4/9)^(1/2)-1)/(-1*2) or t_1 = (-(4/9)^(1/2)-1)/(-1*2)
t_1 = 1/6 or t_1 = 5/6
t_1 = 1/6
x^-1-1/6 = 0
1*x^-1 = 1/6 // : 1
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
t_1 = 5/6
x^-1-5/6 = 0
1*x^-1 = 5/6 // : 1
x^-1 = 5/6
-1 < 0
1/(x^1) = 5/6 // * x^1
1 = 5/6*x^1 // : 5/6
6/5 = x^1
x = 6/5
x in { 6, 6/5 }
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