In ordinary mathematics, only 25 can equal 25.
There are other answers if you consider equivalence classes, but even that will be a number belonging to the same equivalence class as 25 and with the same properties as 25, but not EQUAL to 25.
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Do you know what same numbers equal 50 ****************************************** 25 + 25 = 50
yes. All numbers to the 1st power equal themselves
50
25 x 25 = 525.
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