-6х + 3 = 9
- 6х = 9 - 3
-6х = 6
х = 6 : (- 6)
х = - 1
4х - 3 = 9 + 2х
4х - 2х = 9 + 3
2х = 12
х = 12 : 2
х = 6
- 5х + 6 = - 4х - 7
- 5х + 4х = - 7 - 6
- 1х = - 13
х = - 13 : ( - 1)
х = 13
2 * (х + 3) = 5х - 3
2х + 6 = 5х - 3
2х - 5х = - 3 - 6
- 3х = - 9
х = - 9 : (- 3)
х = 3
- 3 * (2у + 1) = - у + 2
-6у - 3 = - у + 2
- 6у + у = 2 + 3
- 5у = 5
у = 5 : (- 5)
у = - 1
х -2 х + 1
----- = -------
5 3
5 * (х + 1) = 3 * (х - 2)
5х + 5 = 3х - 6
5х - 3х = - 6 - 5
2х = - 11
х = - 11/2
х = - 5 1/5 = - 5,5
х + 8 х - 5
-------- = --------
9 4
9 * (х - 5) = 4 * (х + 8)
9х - 45 = 4х + 32
9х - 4х = 32 + 45
5х = 77
х = 77/5 = 15,4