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what is the x in roman numerals?, please answer. thanks in advance

I 1 (one) (unus)

V 5 (five) (quinque)

X 10 (ten) (decem)

L 50 (fifty) (quinquaginta)

C 100 (one hundred) (centum)

D 500 (five hundred) (quingenti)

M 1,000 (one thousand) (mille)