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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18.75/x = 1.3636 // - 1.3636
18.75/x-1.3636 = 0
18.75*x^-1 = 1.3636 // : 18.75
x^-1 = 0.07272533
-1 < 0
1/(x^1) = 0.07272533 // * x^1
1 = 0.07272533*x^1 // : 0.07272533
13.75036731 = x^1
x = 13.75036731
x = 13.75036731
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