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sabina1310197905

Ответ:

Пошаговое объяснение:

В первой полке-x книг

Во второй полке-2x

В третьей полке-x+4

X+2x+x+4=88

4x=88-4

4x=84

X=84÷4=21(в первой полке)

21×2=42(во второй полке)

21+4=25(в третьей полке)

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