Пошаговое объяснение:
1) x+7/12 = 3/4
x = 3/4-7/12 = 1/6
x= 1/6
2) x-1/6 = 1/9
x = 1/9+1/6 = 5/18
x = 5/18
3) x-3/5 = 3/8
x= 3/8+3/5 = 39/40
x = 39/40
4) x+5/24 = 7/12
x = 7/12-5/24 = 3/8
x = 3/8
5) y+2/7 = 1/3
y = 1/3-2/7 = 1/21
y = 1/21
6) x-1/6=7/9
x=7/9+1/6=17/18
x=17/18
7) y-3/8=5/32
y=5/32+3/8 = 17/32
x = 17/32
8) y+2/5=1/2
y=1/2-2/5 = 1/10
y= 1//10
