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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
17/2 = 36/x // - 36/x
17/2-(36/x) = 0
17/2-36*x^-1 = 0
-36*x^-1 = -17/2 // : -36
x^-1 = 17/72
-1 < 0
1/(x^1) = 17/72 // * x^1
1 = 17/72*x^1 // : 17/72
72/17 = x^1
x = 72/17
x = 72/17
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