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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
72/x = 0.072 // - 0.072
72/x-0.072 = 0
72*x^-1 = 0.072 // : 72
x^-1 = 0.001
-1 < 0
1/(x^1) = 0.001 // * x^1
1 = 0.001*x^1 // : 0.001
1000 = x^1
x = 1000
x = 1000
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