[ Х - 1 ( 2/5 ) ] : 10 + 7 ( 5/12 ) = 9 ;
[ Х - 1 ( 2/5 ) ] : 10 = 9 - 7 ( 5/12 ) ;
[ Х - 1 ( 2/5 ) ] : 10 = 1 ( 7/12 ) ;
Х - 1 ( 2/5 ) = ( 19/12 ) * 10 ;
Х - 1 ( 2/5 ) = 190/12 ;
Х = 190/12 + 1 ( 2/5 ) ;
Х = ( 190/12 ) + ( 7/5 ) ;
Х = ( 950/60 ) + ( 84/60 ) ;
Х = 1034/60 ;
Х = 17 ( 14/60 ) ;
Х = 17 ( 7/30 )