1)-х+7=6х
-х-6х=-7
-7х=-7
Х=1
2)2(7+9х)=0
14+18х=0
18х=-14
Х=-14/18
Х=-7/9
3)0,6х+100=0,9х+1
0,6х-0,9х=1-100
-0,3х=-99
Х=330
4)10х+3(7-2х)=13+2х
10х+21-6х=13+2х
10х-6х-2х=13-21
2х=-8
Х=-4
1)-х+7=6х
-х-6х=-7
-7х=-7
Х=1
2)2(7+9х)=0
14+18х=0
18х=-14
Х=-14/18
Х=-7/9
3)0,6х+100=0,9х+1
0,6х-0,9х=1-100
-0,3х=-99
Х=330
4)10х+3(7-2х)=13+2х
10х+21-6х=13+2х
10х-6х-2х=13-21
2х=-8
Х=-4