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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((3-(1/x))/3)/5 = (1/2)^-2 // - (1/2)^-2
((3-(1/x))/3)/5-(1/2)^-2 = 0
((3-x^-1)/3)/5-(1/2)^-2 = 0
(3-x^-1)/(3*5)-4 = 0
(3-x^-1)/(3*5)+(-4*3*5)/(3*5) = 0
3-x^-1-4*3*5 = 0
-x^-1-57 = 0
(-x^-1-57)/(3*5) = 0
(-x^-1-57)/(3*5) = 0 // * 3*5
-x^-1-57 = 0
-1*x^-1 = 57 // : -1
x^-1 = -57
-1 < 0
1/(x^1) = -57 // * x^1
1 = -57*x^1 // : -57
-1/57 = x^1
x = -1/57
x = -1/57
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