Раньше и позже: решите задачу в уме!
Эту арифметическую задачу предлагается решить в уме, не записывая никаких уравнений и проч.
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![PUDRA - ШЛАК [ demo version ]](https://sun9-41.userapi.com/SDphsqXlcGuaEch4CHBB45fOJwu1OfBfayBvDQ/wfR-YtIC41U.jpg)
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