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subtract 2a³ + 5a² + 3a + 7 from 0
This equation, crossing from big to small
0
- (2a³ + 5a² + 3a + 7)
= -2a³ - 5a² - 3a - 7
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"0" is the medium or entrance, which allows us to connect two opposite things.
reality to virtuality, big to small, in fact it determines relation between every opposite things.
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