SOLUTION: When 18 is subtracted from four times a certain number, the result is the original number. What is the number?

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Question 550549: When 18 is subtracted from four times a certain number, the result is the original number. What is the number?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
"When 18 is subtracted from four times a certain number, the result is the original number." means that we have the equation 4n-18=n. Let's solve this equation for n.


4n-18=n Start with the given equation.


4n=n%2B18 Add 18 to both sides.


4n-n=18 Subtract n from both sides.


3n=18 Combine like terms on the left side.


n=%2818%29%2F%283%29 Divide both sides by 3 to isolate n.


n=6 Reduce.


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Answer:

So the solution is n=6


So the unknown number is 6