x + (x + 40) = 262
x + x + 40 = 262
2x = 262 - 40
x = 222 : 2
x = 111
Подстановка:
111 + (111 + 40) = 262
262 = 262
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Решение:
x + (x + 40) = 262
x + x + 40 = 262
2x = 262 - 40
x = 222 : 2
x = 111
Подстановка:
111 + (111 + 40) = 262
262 = 262