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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3600/x-3 = 0
3600*x^-1 = 3 // : 3600
x^-1 = 1/1200
-1 < 0
1/(x^1) = 1/1200 // * x^1
1 = 1/1200*x^1 // : 1/1200
1200 = x^1
x = 1200
x = 1200
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