Решить уравнение 2/3/ (х*4/9 - 4/9)+1/20=4/5

2/3:(х*4/9-4/9)+1/20=4/5
2/3:(х*4/9-4/9)=4/5-1/20
2/3:(х*4/9-4/9)=3/4
х*4/9-4/9=2/3:3/4
х*4/9-4/9=8/9
х*4/9=8/9+4/9
х*4/9=12/9
х=12/9:4/9
х=3