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y in (-oo:+oo)
(3/10)*y^2-50+10 = 0
3/10*y^2 = 40 // : 3/10
y^2 = 400/3
y^2 = 400/3 // ^ 1/2
abs(y) = (400/3)^(1/2)
y = (400/3)^(1/2) or y = -(400/3)^(1/2)
y in { (400/3)^(1/2), -(400/3)^(1/2) }
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