Question: Simplification of Expression

Why does

5103*`Ω`*(5*sqrt(7)+16)/((1+2*sqrt(7))^(3/2)*(7+2*sqrt(7))*(-2+sqrt(7))*(14+sqrt(7))*(2*sqrt(7)-1)*(4+sqrt(7)))

 

not simplify to

sqrt(1+2*sqrt(7))*`Ω`

 

???

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