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x in (-oo:+oo)
(46/2)*(18-(13*x^4)) = 0
(46/2)*(18-13*x^4) = 0
23*(18-13*x^4) = 0
( 18-13*x^4 )
-13*x^4 = -18 // : -13
x^4 = 18/13
x^4 = 18/13 // ^ 1/4
abs(x) = (18/13)^(1/4)
x = (18/13)^(1/4) or x = -(18/13)^(1/4)
( 23 )
23 = 0
x belongs to the empty set
x in { (18/13)^(1/4), -(18/13)^(1/4) }
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