4(х - 5) - (7х + 9) = 1
4х - 20 - 7х - 9 = 1
- 3х - 29 = 1
- 3х = 1 + 29
- 3х = 30
х = 30 :(-3)
х = - 10
--------------------------
4( - 10 - 5) - (7 * (-10) + 9) = 1
4 * (-15) - ( - 70 + 9) = 1
- 60 - (-61) = 1
- 60 + 61 = 1
1 = 1
2х - 3(4-х) = 5 - (х - 1)
2х - 12 + 3х = 5 - х + 1
5х - 12 = 6 - х
5х + х = 6 + 12
6х = 18
х = 18:6
х = 3
----------------------------
2 * 3 - 3(4-3) = 5 - (3 - 1)
6 - 3*1 = 5 - 2
3 = 3
8(3 - 2х ) - (х - 2) = 9
24 - 16х - х + 2 = 9
26 - 17х = 9
- 17х = 9 - 26
- 17х = - 17
х = (-17) : ( -17)
х = 1
-----------------------------
8( 3 - 2*1) - (1 - 2) = 9
8 * 1 - (-1) = 9
8 + 1 = 9
9 = 9
5х - 6(2х + 7) = 13 - (х + 1)
5х - 12х - 42 = 13 - х - 1
- 7х - 42 = 12 - х
- 7х + х = 12 + 42
- 6х = 54
х = 54 : ( - 6)
х = - 9
---------------------------
5 * (-9) - 6( 2 *(-9) + 7) = 13 - ( - 9 +1)
- 45 - 6( - 18 + 7) = 13 - (-8)
- 45 - 6 * (-11) = 13 + 8
- 45 + 66 = 21
21 = 21