three times a number,n, minus the sum of two and n equals 18. what is the value on n?

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The answer is 10 i think because ifyou add 2 to 18 you get 20 so three times nis more than 20 but it also says -n so it would only be n x 2 to get to 20 and 10 x 2 is 20 so the answer must be 10
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