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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1500/x = 600-(20*p) // - 600-(20*p)
20*p+1500/x-600 = 0
1500*x^-1 = -(20*p-600) // : 1500
x^-1 = (600-(20*p))/1500
-1 < 0
1/(x^1) = (600-(20*p))/1500 // * x^1
1 = x^1*((600-(20*p))/1500) // : (600-(20*p))/1500
1500*(600-20*p)^-1 = x^1
x = 1500*(600-20*p)^-1
x = 1500*(600-20*p)^-1
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