18,3/6=с/0,6
3,05=с/0,6
с=3,05*0,6
с= 1,83
3х-1,2/7=2х-0,6/3
3х- 2х=-0,6/3+ 1,2/7
х=-2/10+12/10:7
х=-2/10+12/70
х= -14/70+12/70
х=-2/70=-1/35
с=(18,3*0,6)/6=1,83
3х-2х=1,2/7-0,6/3
х=(1,2*3-0,6*7)/21
х=-0,03
