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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 12/2.5 // - 12/2.5
3/x-(12/2.5) = 0
3/x-4.8 = 0
3*x^-1 = 4.8 // : 3
x^-1 = 1.6
-1 < 0
1/(x^1) = 1.6 // * x^1
1 = 1.6*x^1 // : 1.6
0.625 = x^1
x = 0.625
x = 0.625
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