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x in (-oo:+oo)
X^2 = (-5/8)*x // - (-5/8)*x
X^2-((-5/8)*x) = 0
X^2+(5/8)*x = 0
X^2+5/8*x = 0 // - X^2
5/8*x = -X^2 // : 5/8
x = (-X^2)/5/8
x = 8/5*X^2
x = 8/5*X^2
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