Почему минус на минус даёт плюс?
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![Вот почему этот материал лучше бетона. Подпорная стена из камня [блоков]. Участок с перепадом высот](https://sun9-5.userapi.com/nWDIIDIyAUTrDaS7p1JnGc8x97TDOZbDbiDV0w/GXNmmoL2R2o.jpg)
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