2х-3 - 1-х + 5х+1 = 9х+3 5 4 20 10 8х-3 - 3х+1 =2 7 10 3х-1 + 6х+3 = 10 2 11 2х+5=2(х-4)+13

1
(2х-3)/5-(1-х)/4+(5х+1)/20=(9х+3)/10
4(2х-3)-5(1-х)+(5х+1)=2(9х+3)
8х-12-5+5х+5х+1-18х-6=0
-22=0
нет решения
2
(8х-3)/7-(3х+1)/10=2
10(8х-3)-7(3х+1)=2*70
80х-30-21х-7=140
59х=140+37
59х=177
х=3
3
(3х-1)/2+(6х+3)/11=10
11(3х-1)+2(6х+3)=10*22
33х-11+12х+6=220
45х=220+5
45х=225
х=5
4
2х+5=2х-8+13
2х-2х=5-5
0=0
х∈R