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x in (-oo:+oo)
(X^2)/4-x = 15 // - 15
(X^2)/4-x-15 = 0
1/4*X^2-x-15 = 0 // - 1/4*X^2-15
-x = -(1/4*X^2-15) // * -1
x = 1/4*X^2-15
x = 1/4*X^2-15
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