1) (3 1/8 + 1 3/4)х = 2 1/6
( 25/8 + 7/4)х = 13/6
( 25 + 7*2) х = 13/6
8
39/8 х = 13/6
х = 13/6 : 39/8
х = 13 * 8 = 4 = 4/9
6*39 3 * 3
2) ( 2 1/12 - 1 5/6)х = 3/4
( 25/12 - 11/6)х = 3/4
( 25 - 11*2 ) х = 3/4
12
1/4 х = 3/4
х = 3/4 : 1/4 = 3 * 4 = 3
4 * 1