Пошаговое объяснение:
1/2b+2/5b-7/10b=4/5
5b + 4b-7b =8
2b = 8
b = 4
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Пошаговое объяснение:
1/2b+2/5b-7/10b=4/5
5b + 4b-7b =8
2b = 8
b = 4