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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
53/2 = 18/x // - 18/x
53/2-(18/x) = 0
53/2-18*x^-1 = 0
-18*x^-1 = -53/2 // : -18
x^-1 = 53/36
-1 < 0
1/(x^1) = 53/36 // * x^1
1 = 53/36*x^1 // : 53/36
36/53 = x^1
x = 36/53
x = 36/53
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