Based on the fact the result of acquired when this number is multiplied by 6 and the product is added to 15, the number in question is -1.
When the number in question is multiplied by 6 and then added to 15, the result is 9. Assuming that number is x, the relevant equation is:
(x × 6 ) + 15 = 9
6x + 15 = 9
6x = 9 - 15
x = -6/6
x = - 1
In conclusion, the number is -1.
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