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How to solve a first-order indefinite equation with the congruence formula (mod) in an instant.
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A complete explanation of the congruence equation (mod) from scratch!
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数A 整数問題 不定方程式
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Solving integers in the common test easily without guidance! 【Math 1A】
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A village that existed for 200 years has become an abandoned village (Hokkaido, Japan)
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