При a=8,9,10 (10/10, 10/9, 10/8 - неправильные дроби, 7/10, 7/9, 7/8 - правильные дроби)
( X - 1 ( 2/23 ) ) + 3 ( 19/23 ) = 5 ( 12/23 ) ;
X - 1 ( 2/23 ) = 5 ( 12/23 ) - 3 ( 19/23 ) ;
X - 1 ( 2/23 ) = 4 ( 35/23 ) - 3 ( 19/23 ) ;
X - 1 ( 2/23 ) = 1 ( 16/23 ) ;
X = 1 ( 16/23 ) + 1 ( 2/23 ) ;
X = 2 ( 18/23 )
E-----------------------------------------------------k
a) e-----------------------------|----------------------------k
б) e---------------|--------------k