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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
240/x = 100 // - 100
240/x-100 = 0
240*x^-1 = 100 // : 240
x^-1 = 5/12
-1 < 0
1/(x^1) = 5/12 // * x^1
1 = 5/12*x^1 // : 5/12
12/5 = x^1
x = 12/5
x = 12/5
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