Z - 4\9Z = 4.5 5\9Z = 4.5 Z = 4.5 : 5\9 Z = 9\2 : 5\9 Z = 9\2 * 9\5 Z = 81\10 Z = 8.1
Z- 4/9z=4,5 5/9z=45/10 Z=81/10=8,1