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x in (-oo:+oo)
x*((4*x^2-(8*x^2))/2) = 0
x*((4*x^2-8*x^2)/2) = 0
(-4*x*x^2)/2 = 0
( -4*x^2 )
-4*x^2 = 0 // : -4
x^2 = 0
x = 0
( x )
x = 0
x in { 0, 0 }
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