A number minus 5, multiplied by 5, plus 5, divided by 5, the final result is still 5, so what's the number?

(5 × 5-5) △ 5 + 5, = (25-5) △ 5 + 5, = 20 △ 5 + 5, = 4 + 5, = 9, answer: this number is 9

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