1) 30+5(3х-1) = 35х-25
30+15х-5 = 35х-25
-35х+15х = -30-25+5
-20х = -50
х = -50:(-20)
х = 2,5
2) 10х-62 = 6(8х+3)-6х
10х-62 = 48х+18-6х
10х-48х+6х = 62+18
-32х = 80
х = 80:(-32)
х = -2,5
3) 4х-6,4 = 0
4х = 0+6,4
4х = 6,4
х = 6,4:4
х = 1,6
4) 3х-8 = 5х+6
3х-5х = 8+6
-2х = 14
х = 14:(-2)
х = -7
5) 7х-(х-4) = 10
7х-х+4 = 10
6х+4 = 10
6х = 10-4
6х = 6
х = 6:6
х = 1