1) (x + 22) - 7 = 42x + 22 - 7 = 42x + 15 = 42x = 42 - 15x = 27
Значит, a = 27.
2) (3 - x) + 4 = 153 - x + 4 = 157 - x = 15-x = 15 - 7-x = 8x = -8
Значит, a = -8.
1) (x + 22) - 7 = 42
x + 22 - 7 = 42
x + 15 = 42
x = 42 - 15
x = 27
Значит, a = 27.
2) (3 - x) + 4 = 15
3 - x + 4 = 15
7 - x = 15
-x = 15 - 7
-x = 8
x = -8
Значит, a = -8.