Question 550549
"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+18}}} Add {{{18}}} to both sides.



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



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



{{{n=(18)/(3)}}} 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