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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/3.69 = 12/x // - 12/x
10/3.69-(12/x) = 0
10/3.69-12*x^-1 = 0
-12*x^-1 = -2.7100271 // : -12
x^-1 = 0.22583559
-1 < 0
1/(x^1) = 0.22583559 // * x^1
1 = 0.22583559*x^1 // : 0.22583559
4.42800003 = x^1
x = 4.42800003
x = 4.42800003
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