Book Maths Puzzle

If 45-45=45 , can you prove it ?

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Book Other Question

There is a number which is greater than the aggregate of its third. tenth and the twelfth parts by 58.Can u guess the number? We have Rs100 ,We should buy 100 things
at Rs.5,Rs.0.75 paise,Rs.0.25 paise,How can we buy ?