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x in (-oo:+oo)
((-4*x)/5)*x = 3/4 // - 3/4
((-4*x)/5)*x-(3/4) = 0
((-4*x)/5)*x-3/4 = 0
-4/5*x^2 = 3/4 // : -4/5
x^2 = -15/16
x belongs to the empty set
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