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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/1 = 136/x // - 136/x
3/1-(136/x) = 0
3-136*x^-1 = 0
-136*x^-1 = -3 // : -136
x^-1 = 3/136
-1 < 0
1/(x^1) = 3/136 // * x^1
1 = 3/136*x^1 // : 3/136
136/3 = x^1
x = 136/3
x = 136/3
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