eighteen less than three times a number equals a number. Whats the number?

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Let that number be N.
{{{3N-18=N}}}
{{{3N-N-18=N-N}}}
{{{2N-18=0}}}
{{{2N-18+18=0+18}}}
{{{2N=18}}}
{{{2N/2=18/2}}}
{{{N=9}}}
Your number is 9.

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