Verified Answer :

SmarticalParticals

3 x 3^2 = 9 x 3
3 x 9 = 9 x 3
27 = 27

Your number is 3

dalendrk

\(D:x eq0\\\\3x^2=9x\ \ \ |divide\ both\ sides\ by\ 3\\\\x^2=3x\ \ \ |subtract\ 3x\ from\ both\ sides\\\\x^2-3x=0\\\\x(x-3)=0\iff x=0 otin D\ or\ x-3=0\\\\\boxed{x=3}\in D\)

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