Ответ:

(4-7х)/15 + (1-х)/3 =4 - (2х+1)/5

4-7х+5(1-х)=4*15 - 3(2х+1)

4 - 7х+5 - 5х=60 - 6х - 3

6х= - 48

х= - 8

(10-у)/6 +(3у+8)/3=(у+6)/2

10-у+2(3у+8)=3(у+6)

10-у+6у+16=3у+18

2у= - 8

у= - 4

(3х+5)/5 +(9х -5)/4=6 +(3х+1)/2

4(3х+5)+5(9х-5)=6*20+10(3х+1)

12х+20+45х-25=120+30х+10

27х=135

х=135:27

х=5

(5-9х)/8 - (3+5х)/4=(5-3х)/2

5-9х -2(3+5х)=4(5-3х)

5-9х - 6 - 10х=20 - 12х

7х= - 21

х= -