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n in (-oo:+oo)
((5*(n+2)^3)/5)*(10*n+5) = 0
(n+2)^3*(10*n+5) = 0
( 10*n+5 )
10*n+5 = 0 // - 5
10*n = -5 // : 10
n = -5/10
n = -1/2
( n+2 )
n+2 = 0 // - 2
n = -2
n in { -1/2, -2, -2, -2 }
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