(7/18 + 5/24z) :3 2/3 = 1/3
7/18 + 5/24z = 1/3* 3 2/3
7/18 + 5/24z=1/3*11/3
7/18 + 5/24z=11/9
5/24z=11/9- 7/18
5/24z=(22-7)/18 числитель-22-7, знамен - 18
5/24z=15/18
5/24z=5/6
z=5/6 : 5/24
z=5/6 * 24/5
z=24/6
z=4
