10x+3(7-2x)=13+2x. (11x+-8)=25. -24(7-9y)= -48 !

1)10х+21-6х-13-2х=0
2х+8=0
2х=-8
х=-4
2)11х+14-5х+8-25=0
6х-3=0
6х=3
х=0,5

10х+21-6х=13+2х
10х+21-6х-13+2х=0
6х+8=0
6х=-8
х=-8/6
х=-1целое 2/6=-1 целое1/3

11х+14-5х+8=25
6х+22-25=0
6х-3=0
6х=3
х=3/6
х=1/2

-168+216у=48
-168+216у-48=0
-216+216у=0
216у=216
у=216/216
у=1