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1) х - было.
(х - 1) - влезло между каждыми двумя людьми по человеку.
х + (х - 1) = (х + х - 1) = (2х - 1) - стало.
2) ((2х - 1) - 1) * 2 = (4х - 4) - влезло по 2 человека.
(2х - 1) + (4х - 4) = (2х - 1 + 4х - 4) = (6х - 5) - стало.
3) ((6х - 5) - 1) * 3 = (6х - 5 - 1) * 3 = (18х - 18) - влезло по 3 человека.
(6х - 5) + (18х - 18) = (6х - 5 + 18х - 18) = (24х - 23) - стало, что
равно 49 человек.
4) 24х - 23 = 49
24х = 49 + 23
24х = 72
х = 72 : 24
х = 3 (человека) - было изначально.
ответ: 3 человека.
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Пошаговое объяснение:
сори