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29 June, 16:08

Ryan is thinking of a number. When he multiplies this number by 6 and then subtracts 15 from the answer, he ends up with his original number. What number is Ryan thinking of?

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  1. 29 June, 16:58
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    6n-15=n

    minus n both sides

    5n-15=0

    add 15 both sides

    5n=15

    divide both sides by 5

    n=3

    de number is 3
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