1. 6 5/8 - х = 1 3/8. x = 6 5/8 - 1 3/8x = 5 2/8x = 5 1/42. х + 1 3/14 = 3 9/14x = 3 9/14 - 1 3/14x = 2 6/14x = 2 3/73. 2 7/18 + х = 15 5/18. x = 15 5/18 - 2 7/18x = 14 23/18 - 2 7/18x = 12 16/18x = 12 8/94. х - 2 5/16 = 4 13/16. x = 4 13/16 + 2 5/16x = 6 18/16x = 7 2/16x = 7 1/85. 23 - х = 18 1/7. x = 23 - 18 1/7x = 22 7/7 - 18 1/17x = 4 6/76. х + 5 15/37 = 34. x = 34 - 5 15/37x = 33 37/37 - 5 15/37x = 28 22/377. (8 5/17 - х) - 2 25/17 = 3 25/17. 8 5/17 - x = 3 25/17 + 2 25/178 5/17 - x = 5 50/17x = 8 5/17 - 5 50/17x = 8 5/17 - 7 16/17x = 7 22/17 - 7 16/17x = 6/178. 20 1/9 - (х - 4 17/19) = 7 18/19. 20 1/9 - x + 4 17/19 = 7 18/1924 18/19 - x = 7 18/19x = 24 18/19 - 7 18/19x = 17