А) 2/3 х + 4/9 х = 16/5
10/9 х = 16/5
х = 16/5 : 10/9
х = (16*9)/(5*10)
х = 72/25
х = 2 22/25
б) 5/12 х - 4/15 х = 51/100
9/60 х = 51/100
3/20 х = 51/100
х = 51/100:3/20
х = (51*20)/(100*3)
х = 51/15
х = 3 6/15
в) х - 0,2х = 8/15
х - 1/5 х = 8/15
4/5 х = 8/15
х = 8/15:4/5
х = (8*5)/(15*4)
х = 2/3