1) -3х = 21
х = 21 : (-3)
х = -7
2) 7х = -56
х = -56 : 7
х = -8
3) -4х + 1 = 13
-4х = 13 - 1
-4х = 12
х = -3
4) -х + 9 = 16
-х = 16 - 9
-х = 5
х = -5
5) 7х + 17 = х - 1
7х - х = -1 - 17
6х = -18
х = -18 : 6
1) -3х = 21
х = 21 : (-3)
х = -7
2) 7х = -56
х = -56 : 7
х = -8
3) -4х + 1 = 13
-4х = 13 - 1
-4х = 12
х = -3
4) -х + 9 = 16
-х = 16 - 9
-х = 5
х = -5
5) 7х + 17 = х - 1
7х - х = -1 - 17
6х = -18
х = -18 : 6
х = -3