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(x^2*(9*x^5-32)*(x+16))/4 = 0
( 9*x^5-32 )
9*x^5 = 32 // : 9
x^5 = 32/9
x^5 = 32/9 // ^ 1/5
x = (32/9)^(1/5)
( x+16 )
x+16 = 0 // - 16
x = -16
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { (32/9)^(1/5), -16, 0 }
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