SOLUTION: I think of a number multiply it by 3 and then add 21 my answer is 74

Question 1071844: I think of a number multiply it by 3 and then add 21 my answer is 74
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!
I think of a number

I think of N

multiply it by 3

I get 3N

and then add 21

I get 3N+21

my answer is 74

I write 3N+21 = 74

So I have the equation

     3N+21 = 74

I add -21 to both sides to cancel the +21 on the left

  3N+21-21 = 74-21

        3N = 53

Then I divide both sides by 3 to cancel the 3

       

         N =  or   

Edwin

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