1)
- 5 ( x - 7 ) = 8 ( - x + 7)
- 5 x + 35 = - 8 x + 56
- 5 x + 8 x = 56 - 35
3 x = 21
x = 21 : 3
x = 7
2)
- 9 ( x - 6 ) = 8 (-x+4)
- 9 x + 54 = - 8 x + 32
- 9x + 8 x = 32 - 54
- x = - 22
x = 22
3)
6 x - 1 = - 37
6 x = - 37 + 1
6 x = - 36
x = ( - 36 ) : 6
x = - 6
4)
8 x - 1 = - 25
8 x = - 25 + 1
8 x = - 24
x = ( - 24 ) : 8
x = - 3