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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
459-((3*b)/x) = 22*P+4*d // - 22*P+4*d
459-(22*P)-((3*b)/x)-(4*d) = 0
459-22*P-3*b*x^-1-4*d = 0
-3*b*x^-1 = -(459-22*P-4*d) // : -3*b
x^-1 = (1/3)*b^-1*(459-22*P-4*d)
-1 < 0
1/(x^1) = (1/3)*b^-1*(459-22*P-4*d) // * x^1
1 = (1/3)*b^-1*x^1*(459-22*P-4*d) // : (1/3)*b^-1*(459-22*P-4*d)
3*b*(459-22*P-4*d)^-1 = x^1
x = 3*b*(459-22*P-4*d)^-1
x = 3*b*(459-22*P-4*d)^-1
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