1,6х+9,4=19,6-1,8х;
1,6х+1,8х=19,6-9,4;
3,4х=10,2; х=10,2:3,4; х=3;////////
-6*(3х+1,2)=7*(1,4-2х);
-18х-7,2=9,8-14х;
-18х+14х=9,8+7,2;
-4х=17; х=-17/4; х=-4 1/4;//////
3 7/15-1 4/15х=1/6+2 1/3х;
-1 4/15х-2 1/3х=1/6-3 7/15;
-3 4/15х-5/15х=5/30-104/30;
-3 9/15х=-99/30;
Х=99/30*15/54; х=11/12;//////