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Ответ дан
polukhinIG290903

Пошаговое объяснение:

2.1a+(2/7)-a+(5/14)-0.8a=0.3a+(4/14)+(5/14)=0.3a+(9/14)= (27a/90)+(45/90)=

=(27a+45)/90

Наверно так.

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