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