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x in (-oo:+oo)
(9/8)*x^2 = -1/4 // + -1/4
(9/8)*x^2-(-1/4) = 0
(9/8)*x^2+1/4 = 0
9/8*x^2 = -1/4 // : 9/8
x^2 = -2/9
x belongs to the empty set
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