1) - 3 * ( X - 4 ) = 5X - 12
- 3X + 12 = 5X - 12
5X + 3X = 12 + 12
8X = 24
X = 3
-----------------------------
2) ( 16X - 5 ) - ( 3 - 5X ) = 6
16X - 6 - 3 + 5X = 6
21X = 15
X = 15/21 = 5/7
-----------------------------
3) 4 * ( 13 - 3X ) - 17 = - 5X
52 - 12X - 17 = - 5X
12X - 5X = 35
7X = 35
X = 5
-------------------------------
4) ( 18 - 3X) - ( 4 + 2X ) = 10
18 - 3X - 4 - 2X = 10
14 - 5X = 10
5X = 4
X = 0,8
-------------------------------
5) 14 - X = 0,5 * ( 4 - 2X ) + 12
14 - X = 2 - X + 12
14 - X = 14 - X
Ответ любые значения переменной Х
-------------------------------
6) 4Х - 3 * ( 20 - X ) = 10X - 3 *( 11 + X )
4X - 60 + 3X = 10X - 33 - 3X
7X - 60 ≠ 7X -