5 - 2(x - 1) = 4 - x

5 - 2(x - 1) = 4 - x
5-2x+2=4-x
-2x+x=4-7
-x=-3|:(-1)
x=3

5 - 2(x - 1) = 4 - x
5 - (2x - 2) = 4 - x
5 - 2x + 2 = 4 - x
7 - 2x  = 4 - x
- 2x + х = 4 - 7
- х = -3
х = 3
ПРОВЕРКА
5 - 2(3 - 1) = 4 - 3
5 - 2×2 = 1
5 - 4 = 1
1 = 1