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D( x )
8*x+72 = 0
8*x+72 = 0
8*x+72 = 0
8*x+72 = 0 // - 72
8*x = -72 // : 8
x = -72/8
x = -9
x in (-oo:-9) U (-9:+oo)
x^6*(((4+36)*((4*x)/(8*x+72)))/4) = 0
(4*40*x*x^6)/(4*(8*x+72)) = 0
( 4*x )
4*x = 0 // : 4
x = 0
( x^6 )
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in { 0, 0 }
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