1. 2х-6х=-20+4
-4=-16
х=4
2. -8х+10х=4.9-4.7
2х=0.2
х=0.1
3.-20х+260=-220
-20х=-480
х=24
4.4+2х+12х-3=10х-7
14х+1=10х-7
4х=-8
х=-2
5.
4.8х+14.8-2.8=5.2х
-0.4х=-12
х=30
6.2/3х-1/5х=3+4
10/15х-3/15х=7
7/15х=7
х=15
