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x in (-oo:+oo)
7/4 = ((4*x)/3)*x-6 // - ((4*x)/3)*x-6
7/4-(((4*x)/3)*x)+6 = 0
(-4/3)*x^2+7/4+6 = 0
-4/3*x^2 = -31/4 // : -4/3
x^2 = 93/16
x^2 = 93/16 // ^ 1/2
abs(x) = (93/16)^(1/2)
x = (93/16)^(1/2) or x = -(93/16)^(1/2)
x in { (93/16)^(1/2), -(93/16)^(1/2) }
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