1 способ:
871 - (x + 157) = 38871 - x - 157 = 38714 - x = 38-x = 385 - 71-x = -32x = 329
2 способ:
871 - (x + 157) = 38(x + 157) = 871 - 38x + 157 = 48x = 486 - 15x = 329
Ответ: x = 329
1 способ:
871 - (x + 157) = 38
871 - x - 157 = 38
714 - x = 38
-x = 385 - 71
-x = -32
x = 329
2 способ:
871 - (x + 157) = 38
(x + 157) = 871 - 38
x + 157 = 48
x = 486 - 15
x = 329
Ответ: x = 329