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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
a^2+((3*a)/2)*a-(9/x)-6 = 0
a^2+((3*a)/2)*a-9*x^-1-6 = 0
-9*x^-1 = -(5/2*a^2-6) // : -9
x^-1 = (6-(5/2*a^2))/(-9)
-1 < 0
1/(x^1) = (6-(5/2*a^2))/(-9) // * x^1
1 = x^1*((6-(5/2*a^2))/(-9)) // : (6-(5/2*a^2))/(-9)
-9*(6-5/2*a^2)^-1 = x^1
x = -9*(6-5/2*a^2)^-1
x = -9*(6-5/2*a^2)^-1
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