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Jane, could you please tell me if there's a formula for it, so that it can be done without a calculator? I only got to the fact that every integer ending with 7 when multiplied has to end with 85 or 35, and if i want the number to begin with 7, i gotta have it start with 14... my brain is kinda stuck
i gotta find an integer that starts with 7 and if that 7 is put at the end of the number it becomes 1/5 of the first number!!
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