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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3.6*10^12)/x = 2*10^12 // - 2*10^12
(3.6*10^12)/x-(2*10^12) = 0
(3.6*10^12)/x-2*10^12 = 0
3600000000000*x^-1 = 2000000000000 // : 3600000000000
x^-1 = 5/9
-1 < 0
1/(x^1) = 5/9 // * x^1
1 = 5/9*x^1 // : 5/9
9/5 = x^1
x = 9/5
x = 9/5
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