3х-х=-3 10/27-1 2/9 -3 10/27-1 2/9=-3 10/27-1 6/27=-4 16/27
2х=-4 16/27
х=-4 16/27:2 -4 16/27:2=-124/27*1/2=-62/27=-2 8/27
х=-2 8/27
проверка 3*(-2 8/27)+1 2/9=-2 8/27-3 10/27
-62/27*3+1 2/9=-5 18/27
-62/9+11/9=-5 6/9
-51/9=-5 2/3
-5 6/9=-5 2/3
-5 2/3=-5 2/3