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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*120)/x-2 = 0
1200*x^-1 = 2 // : 1200
x^-1 = 1/600
-1 < 0
1/(x^1) = 1/600 // * x^1
1 = 1/600*x^1 // : 1/600
600 = x^1
x = 600
x = 600
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