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x in (-oo:+oo)
7*y = (1/7)*x^2 // - (1/7)*x^2
7*y-((1/7)*x^2) = 0
(-1/7)*x^2+7*y = 0
-1/7*x^2 = -(7*y) // : -1/7
x^2 = 49*y
x^2 = 49*y // ^ 1/2
abs(x) = 7*y^(1/2)
x = 7*y^(1/2) or x = -(7*y^(1/2))
x in { 7*y^(1/2), -(7*y^(1/2)) }
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