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x in (-oo:+oo)
y = (x/2)*(x/5) // - (x/2)*(x/5)
y-((x/2)*(x/5)) = 0
(-1/10)*x^2+y = 0
-1/10*x^2 = -y // : -1/10
x^2 = 10*y
x^2 = 10*y // ^ 1/2
abs(x) = 10^(1/2)*y^(1/2)
x = 10^(1/2)*y^(1/2) or x = -(10^(1/2)*y^(1/2))
x in { 10^(1/2)*y^(1/2), -(10^(1/2)*y^(1/2)) }
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