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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(X^2)/x+40 = 20 // - 20
(X^2)/x-20+40 = 0
X^2*x^-1 = -20 // : X^2
x^-1 = -20/(X^2)
-1 < 0
1/(x^1) = -20/(X^2) // * x^1
1 = (-20/(X^2))*x^1 // : -20/(X^2)
1/(-20/(X^2)) = x^1
x = 1/(-20/(X^2))
x = 1/(-20/(X^2))
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