SOLUTION: twice a certain number is subtracted from 9 times the number, the result is 21. find the number

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Question 683558: twice a certain number is subtracted from 9 times the number, the result is 21. find the number
Answer by amc4452(2) About Me  (Show Source):
You can put this solution on YOUR website!
9x-2x=21 on left subtract the like terms
7x=21 divide both sides by 7
7x/7=21/7 simply
x=3
check
9(3)-2(3)=21
27 - 6 =21