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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
40/x = 30/2.5 // - 30/2.5
40/x-(30/2.5) = 0
40/x-12 = 0
40*x^-1 = 12 // : 40
x^-1 = 3/10
-1 < 0
1/(x^1) = 3/10 // * x^1
1 = 3/10*x^1 // : 3/10
10/3 = x^1
x = 10/3
x = 10/3
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