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x in (-oo:+oo)
((x^5)/8)*((x^3)/8-((x^11)/8)) = 0
1/8*x^5*(1/8*x^3-1/8*x^11) = 0
1/8*x^3-1/8*x^11 = 0
1/8*x^3*(1-x^8) = 0
-1*x^8 = -1 // : -1
x^8 = 1
x^8 = 1 // ^ 1/8
abs(x) = 1
x = 1 or x = -1
1/8*x^3*(x-1)*(x+1) = 0
1/8*1/8*x^3*x^5*(x-1)*(x+1) = 0
( 1/8*x^3 )
1/8*x^3 = 0 // : 1/8
x^3 = 0
x = 0
( 1/8*x^5 )
1/8*x^5 = 0 // : 1/8
x^5 = 0
x = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 0, 0, -1, 1 }
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