3.
6s+(3s-2)=14
6s+3s-2=14
9s=14+2
9s=16
s=16:9
s=1 7/9
5/
(6х+1)-(3-2х)=14
6х+1-3+2х=14
8х=14+2
х=16:8
х=2
6.
(6-2с)+4= - 5с-3
6-2с+4= - 5с-3
- 2с+5с= - 3-6-4
3с= - 13
с= - 13:3
с= - 4 1/3
8.
(7-10k)-(8-8k)+(10k+6)= - 8
7-10k-8+8k+10k+6= - 8
8k= - 8-5
8k= - 13
k= - 13:8
k= - 1 5/8
9.
6у-20=2(5у-10)-4у
6у-20=10у-20-4у
6у-10у+4у= - 20+20
0=0
11.
4(х+3,6)=3х-1,4
4х+14,4=3х-1,4
4х-3х= - 1,4 - 14,4
х= - 15,8