SOLUTION: four times a number is 21 more than the number. What is the number?

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Question 172568: four times a number is 21 more than the number. What is the number?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
let the number be a
:
4a=a+21
:
3a=21.....subtracting a from both sides
:
highlight%28a=7%29 after dividing both sides by 3