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Let x be the unknown number and let y be the ten's digit,

then x = 10y + y - 3 = 11y - 3,

and x = 8 + 6(y + y - 3) = 8 + 6(2y - 3) = 8 + 12y - 18 = 12y -10,

therefore 12y - 10 = 11y - 3.

Subtracting 11y and adding 10 to each side, y = 7.

Since the ten's digit is 7, the unit's digit must be 4, and the number is 74.

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