1/21y-1/3y1/14y=5/14
если 1/3y+1/14y. то решение такое
4/84y - 28/84y + 6/84y = 5/14
-18/84y = 5/14
-9/42y = 5/14
y = - 5/14:9/42= - 5/14*42/9= - 5/3 = - 1 2/3
если 1/3y - 1/14y. то решение такое
4/84y - 28/84y - 6/84y = 5/14
-15/42y = 5/14
y = -5/14:15/42 = -5/14*42/15 = -1
9,6-(2,6-y)=4
7 - y = 4
3=y
4,2+(x-5,8)=2,5
4,2 + x - 5,8 = 2,5
x = 4,1
0,7x-0,4x-0,96x=12,73
-0,66x = 12,73
x = - 19,28(78)