450 : X + 50 = 2 * 70 = 140
450 : Х = 140 - 50 = 90
Х = 450 : 90 = 5
Проверка
(450 : 5 + 50) : 70 = 140 : 70 = 2
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Answers & Comments
450 : X + 50 = 2 * 70 = 140
450 : Х = 140 - 50 = 90
Х = 450 : 90 = 5
Проверка
(450 : 5 + 50) : 70 = 140 : 70 = 2