10Х+7=8Х–9
10Х–8Х = –9–7
2Х = –16
Х = –16/2
Х = –8
10Х+7=8Х-9 10Х–8Х = –9–7 2Х = -16 Х = -16/2 Х = -8
10Х+7=8Х–9
10Х–8Х = –9–7
2Х = –16
Х = –16/2
Х = –8
10Х+7=8Х-9 10Х–8Х = –9–7 2Х = -16 Х = -16/2 Х = -8