(5х+1)/3=(1+8х)/5
3(1+8х)=5(5х+1)
3+24х=25х+5
24х-25х=5-3
-х=2
Х=-2
(4х-5)/7-(9х-25)/2=0
(4х-5)/7= (9х-25)/2
7(9х-25)= 2(4х-5)
63х-175= 8х-10
63х-8х= -10+175
55х= 165
Х= 3
(5х+8)/3+(11х-1)/6=-1 |*6
2(5х+8)+(11х-1)= -6
10х+16+11х-1=-6
10х+11х= -6-16+1
21х= -21
Х=-1
(4х+9)/5-(4+3х)/2=4 |*10
2(4х+9)-5(4+3х)=40
8х+18-20-15х=40
8х-15х= 40-18+20
-7х=42
Х=-6