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x in (-oo:+oo)
(-x/(-3))*x = 26*y+14 // - 26*y+14
(-x/(-3))*x-(26*y)-14 = 0
(-x/(-3))*x-26*y-14 = 0
1/3*x^2 = -(-26*y-14) // : 1/3
x^2 = 3*(14-(-26*y))
x^2 = 3*(26*y+14) // ^ 1/2
abs(x) = 3^(1/2)*(26*y+14)^(1/2)
x = 3^(1/2)*(26*y+14)^(1/2) or x = -(3^(1/2)*(26*y+14)^(1/2))
x in { 3^(1/2)*(26*y+14)^(1/2), -(3^(1/2)*(26*y+14)^(1/2)) }
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