1,2856=  ( Nmax ) / (   1+ (Nmax / 0,4523 -1) e-0,0607*20   )
1,2856*(   1+ (Nmax / 0,4523 -1) e-0,0607*20   ) =  ( Nmax ) 
1,2856+   1,2856 (Nmax / 0,4523 -1) e-0,0607*20   ) =  ( Nmax ) 
1,2856+   0,3818 (Nmax / 0,4523 -1)  =  Nmax       
1,2856+   0,3818 *Nmax / 0,4523 -   0,3818 =  Nmax       
0,9037 +   0,3818 *Nmax / 0,4523      =  Nmax       
0,9037 +   0,8442 *Nmax          =  Nmax       
0,9037           =  0,1558 Nmax    
5,800          =   Nmax