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Engels Pavlov

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Find number abc If b1451 - 6ab3c = 1b6a1 find number abc. Multiple solutions may exist.
Find number abc If ab8bc + baab4 = 1aa1b1 find number abc. Multiple solutions may exist.
What 5-digit number satisfies the following requirements? What 5-digit number satisfies the following requirements? 1. No zeroes; 2. First two digits are the same; 3. Fourth digit is twice the first; 4. Last digit is twice the third; 5. Sum of all digits is 18

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