Z-4/9z=4'9 помогите срочно я тупой

z-(4/9)z=4.54.5=45/10z(1-4/9)=45/105/9z=45/10z=45/10*9/5=81/10=8.1  или z-4/9z =4.5(9z-4)/9z=4.59z-4=40,5zz(9-40,5)=4z=4/(9-40.5)=4/31.5=8/63

z - 4/9z = 4,9 5/9z = 4/9 z = 4/9 : 5/9 z = 4/5