21 1/4-(x+2 5/12)=6 7/8 решите уравнение
х+2 5/12 = 21 1/4 - 6 7/8 1 7 2-7 8+2-7 3
х+2 5/12 = 14 3/8 (21-- - 6-- = 15----- = 14------- = 14-- )
х=14 3/8 - 2 5/12 4 8 8 8 8
х=11 23/24
3 5 9-10 24+9-10 23
(14-- - 2-- = 12------ = 11--------- = 11---)
8 12 24 24 23