1) 4/7х + 1 3/7 = 6/7х - 5 5/7;
4/7х - 6/7х = -5 5/7 - 1 3/7;
-2/7х = -7 1/7;
х = -7 1/7 : (- 2/7);
х = - 50/7 : (- 2/7);
х = - 50/7 * (- 7/2);
х = 25.
2) 2(х-3)-4(х+1)=5х-38;
2х-6-4х-4=5х-38;
2х-4х-5х=-38+6+4;
-7х=-28;
х=4.
3) 5/9х+ 17/9=2/9+7/9;
5/9х=2/9+7/9-17/9;
5/9х=-8/9;
х=-8/9:5/9;
х=-8/5;
х=-1,8.
4) 2(х+2)-4(х-3)=5х+9;
2х+4-4х+12=5х+9;
2х-4х-5х=9-4-12;
-7х=-7;
х=1.