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x in (-oo:+oo)
(X^2)/3-((x^1)/3) = 49 // - 49
(X^2)/3-((x^1)/3)-49 = 0
(X^2)/3-(x/3)-49 = 0
1/3*X^2-1/3*x-49 = 0 // - 1/3*X^2-49
-1/3*x = -(1/3*X^2-49) // : -1/3
x = (-(1/3*X^2-49))/(-1/3)
x = -3*(49-(1/3*X^2))
x = -3*(49-(1/3*X^2))
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