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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2.5*4.8)/x = 30 // - 30
(2.5*4.8)/x-30 = 0
12*x^-1 = 30 // : 12
x^-1 = 5/2
-1 < 0
1/(x^1) = 5/2 // * x^1
1 = 5/2*x^1 // : 5/2
2/5 = x^1
x = 2/5
x = 2/5
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