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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
75/x = (1/300)/4 // - (1/300)/4
75/x-((1/300)/4) = 0
75/x-1/1200 = 0
75*x^-1 = 1/1200 // : 75
x^-1 = 1/90000
-1 < 0
1/(x^1) = 1/90000 // * x^1
1 = 1/90000*x^1 // : 1/90000
90000 = x^1
x = 90000
x = 90000
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