1)
( 101 4/7 - Х ) : 29 = 1/14
101 4/7 - Х = 1/14 * 29
101 4/7 - X = 29/14
101 4/7 - X = 2 1/14
101 4/7 - 2 1/14 = X
X = 99 3/14
-------------------------------
3)
6 17/27 : ( X - 76 2/9 ) = 1 2/3
X - 76 2/9 = 6 17/27 : 1 2/3
X - 76 2/9 = 179/27 : 5/3
X - 76 2/9 = 179/45
X - 76 2/9 = 3 44/45
X = 3 44/45 + 76 2/9
X = 3 44/45 + 76 10/45
X = 79 54/45
X = 90 9/45
X = 90 1/5
X = 90,2
------------------------------
2)
68,7 + X = 3 * 28 1/90
68,7 + X = 3 * 2521/90
68,7 + X = 2521/30
68,7 + X = 84,0334
X = 84,0334 - 68,7
X = 15,3334
------------------------------
4)
24,3 + X = 131 6/35 : 2
24,3 + X = 131,01715 : 2
24,3 + X = 65,5086
X = 65,5086 - 24,3
X = 41,2086