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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2-((5/2)*a) = (2*a)/x-3 // - (2*a)/x-3
2-((5/2)*a)-((2*a)/x)+3 = 0
(-5/2)*a-2*a*x^-1+2+3 = 0
-2*a*x^-1 = -(5-5/2*a) // : -2*a
x^-1 = (1/2)*a^-1*(5-5/2*a)
-1 < 0
1/(x^1) = (1/2)*a^-1*(5-5/2*a) // * x^1
1 = (1/2)*a^-1*x^1*(5-5/2*a) // : (1/2)*a^-1*(5-5/2*a)
2*a*(5-5/2*a)^-1 = x^1
x = 2*a*(5-5/2*a)^-1
x = 2*a*(5-5/2*a)^-1
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