2 1/7x - 3 9/14x+x=3
30/14х-51/14х+х=3
-3/2х+х=3
-1 1/2х+х=3
-1/2х=3
х=3:(-1/2)
х=-6
2 1/7x+х-3 9/14х=3
3 1/7х-3 9/14=3
-0,5х=3
2 1/7x - 3 9/14x+x=3
30/14х-51/14х+х=3
-3/2х+х=3
-1 1/2х+х=3
-1/2х=3
х=3:(-1/2)
х=-6
2 1/7x - 3 9/14x+x=3
2 1/7x+х-3 9/14х=3
3 1/7х-3 9/14=3
-0,5х=3
х=-6