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