15 3/8 : ( 2 3/4 * х + 5 5/6) - 1 1/2 = 3/4
15 3/8 : ( 2 3/4 * х + 5 5/6) = 3/4 + 1 2/4
15 3/8 : (2 3/4 * х + 5 5/6) = 2 1/4
2 3/4 *х + 5 5/6 = 15 3/8 : 2 1/4
2 3/4 * х + (35/6) = 123/8 * 4/9
2 3/4 * х = 41/6 - 35/6
х= 1 : 2 3/4 = 1 *4/11
х = 4/11
3 1/3 - (4 1/5 *х + х ) : 5 4/7 = 8/15
5 1/5 * х : 5 4/7 = 3 1/3 - 8/15
5 1/5 * х : 5 4/7 = 3 5/15 - 8/15
5 1/5 * х = 2 4/5 * 5 4/7
5 1/5 * х = 14/5 * 39/7
х =78/5 : 5 1/5 = 78/5 * 5/26 =3/1
х=3