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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.5/10 = 12/x // - 12/x
2.5/10-(12/x) = 0
2.5/10-12*x^-1 = 0
-12*x^-1 = -0.25 // : -12
x^-1 = 0.02083333
-1 < 0
1/(x^1) = 0.02083333 // * x^1
1 = 0.02083333*x^1 // : 0.02083333
48.00000768 = x^1
x = 48.00000768
x = 48.00000768
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