Икс +2 3/8=5 1/4-1 3/8

х + 2 3/8 = 5 1/4 - 1 3/8;

х + (2 * 8 + 3)/8 = (5 * 4 + 1)/4 - (1 * 8 + 3)/8;

х + (16 + 3)/8 = (20 + 1)/4 - (8 + 3)/8;

х + 19/8 = 21/4 - 11/8;

х = 21/4 - 11/8 - 19/8;

х = 42/8 - 11/8 - 19/8;

х = (42 - 11 - 19)/8;

х = 12/8 = 3/2 = 1,5.

Ответ: х = 1,5.