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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x = 30/42 // - 30/42
24/x-(30/42) = 0
24/x-5/7 = 0
24*x^-1 = 5/7 // : 24
x^-1 = 5/168
-1 < 0
1/(x^1) = 5/168 // * x^1
1 = 5/168*x^1 // : 5/168
168/5 = x^1
x = 168/5
x = 168/5
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