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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12.5/1.2 = 6.25/x // - 6.25/x
12.5/1.2-(6.25/x) = 0
12.5/1.2-6.25*x^-1 = 0
-6.25*x^-1 = -10.41666667 // : -6.25
x^-1 = 1.66666667
-1 < 0
1/(x^1) = 1.66666667 // * x^1
1 = 1.66666667*x^1 // : 1.66666667
0.6 = x^1
x = 0.6
x = 0.6
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