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x in (-oo:+oo)
x^4*((x+11)/2) = 0
(x^4*(x+11))/2 = 0
( x+11 )
x+11 = 0 // - 11
x = -11
( x^4 )
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in { -11, 0 }
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