5/12х-4/15=0,51 х-0,2х=8/15 2/3х+4/9=3,2...реешиите очч надо)
5/12х = 51/100+4/15 = 233/30 х = 233/300 : 5/12 = 233/125 = 1,864 0,8х = 8/15 8/10х = 8/15 х = 8/15 :8/10 = 2/3 2/3х = 16/5-4/9 = 124/45 х = 62/15 = 4 2/15