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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
75/x = 15/60 // - 15/60
75/x-(15/60) = 0
75/x-1/4 = 0
75*x^-1 = 1/4 // : 75
x^-1 = 1/300
-1 < 0
1/(x^1) = 1/300 // * x^1
1 = 1/300*x^1 // : 1/300
300 = x^1
x = 300
x = 300
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